We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
arrow dep missing
Fresh install of ubuntu 16.04

```
$ sudo apt update && sudo apt install python3-pip
...
$ pip3 install opsdroid
...
$ opsdroid
Traceback (most recent call last):
  File "/home/ubuntu/.local/bin/opsdroid", line 7, in <module>
    from opsdroid.__main__ import main
  File "/home/ubuntu/.local/lib/python3.5/site-packages/opsdroid/__main__.py", line 8, in <module>
    from opsdroid.core import OpsDroid
  File "/home/ubuntu/.local/lib/python3.5/site-packages/opsdroid/core.py", line 15, in <module>
    from opsdroid.parsers.crontab import parse_crontab
  File "/home/ubuntu/.local/lib/python3.5/site-packages/opsdroid/parsers/crontab.py", line 6, in <module>
    import arrow
ImportError: No module named 'arrow'
```

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `setup.py`
Content:
```
1 #!/usr/bin/env python3
2 import os
3 from setuptools import setup, find_packages
4 from opsdroid.const import __version__
5 
6 PACKAGE_NAME = 'opsdroid'
7 HERE = os.path.abspath(os.path.dirname(__file__))
8 
9 PACKAGES = find_packages(exclude=['tests', 'tests.*', 'modules',
10                                   'modules.*', 'docs', 'docs.*'])
11 
12 REQUIRES = [
13     'pyyaml>=3.11,<4',
14     'aiohttp>=1.2.0,<2',
15     'pycron>=0.40',
16 ]
17 
18 setup(
19     name=PACKAGE_NAME,
20     version=__version__,
21     license='GNU GENERAL PUBLIC LICENSE V3',
22     url='',
23     download_url='',
24     author='Jacob Tomlinson',
25     author_email='jacob@tom.linson.uk',
26     description='An open source chat-ops bot.',
27     packages=PACKAGES,
28     include_package_data=True,
29     zip_safe=False,
30     platforms='any',
31     install_requires=REQUIRES,
32     test_suite='tests',
33     keywords=['bot', 'chatops'],
34     entry_points={
35         'console_scripts': [
36             'opsdroid = opsdroid.__main__:main'
37         ]
38     },
39 )
40
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -10,9 +10,10 @@
                                   'modules.*', 'docs', 'docs.*'])
 
 REQUIRES = [
-    'pyyaml>=3.11,<4',
-    'aiohttp>=1.2.0,<2',
-    'pycron>=0.40',
+    'arrow==0.10.0',
+    'aiohttp==2.1.0',
+    'pycron==0.40',
+    'pyyaml==3.12'
 ]
 
 setup(

{"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -10,9 +10,10 @@\n                                   'modules.*', 'docs', 'docs.*'])\n \n REQUIRES = [\n-    'pyyaml>=3.11,<4',\n-    'aiohttp>=1.2.0,<2',\n-    'pycron>=0.40',\n+    'arrow==0.10.0',\n+    'aiohttp==2.1.0',\n+    'pycron==0.40',\n+    'pyyaml==3.12'\n ]\n \n setup(\n", "issue": "arrow dep missing\nFresh install of ubuntu 16.04\r\n\r\n```\r\n$ sudo apt update && sudo apt install python3-pip\r\n...\r\n$ pip3 install opsdroid\r\n...\r\n$ opsdroid\r\nTraceback (most recent call last):\r\n  File \"/home/ubuntu/.local/bin/opsdroid\", line 7, in <module>\r\n    from opsdroid.__main__ import main\r\n  File \"/home/ubuntu/.local/lib/python3.5/site-packages/opsdroid/__main__.py\", line 8, in <module>\r\n    from opsdroid.core import OpsDroid\r\n  File \"/home/ubuntu/.local/lib/python3.5/site-packages/opsdroid/core.py\", line 15, in <module>\r\n    from opsdroid.parsers.crontab import parse_crontab\r\n  File \"/home/ubuntu/.local/lib/python3.5/site-packages/opsdroid/parsers/crontab.py\", line 6, in <module>\r\n    import arrow\r\nImportError: No module named 'arrow'\r\n```\n", "before_files": [{"content": "#!/usr/bin/env python3\nimport os\nfrom setuptools import setup, find_packages\nfrom opsdroid.const import __version__\n\nPACKAGE_NAME = 'opsdroid'\nHERE = os.path.abspath(os.path.dirname(__file__))\n\nPACKAGES = find_packages(exclude=['tests', 'tests.*', 'modules',\n                                  'modules.*', 'docs', 'docs.*'])\n\nREQUIRES = [\n    'pyyaml>=3.11,<4',\n    'aiohttp>=1.2.0,<2',\n    'pycron>=0.40',\n]\n\nsetup(\n    name=PACKAGE_NAME,\n    version=__version__,\n    license='GNU GENERAL PUBLIC LICENSE V3',\n    url='',\n    download_url='',\n    author='Jacob Tomlinson',\n    author_email='jacob@tom.linson.uk',\n    description='An open source chat-ops bot.',\n    packages=PACKAGES,\n    include_package_data=True,\n    zip_safe=False,\n    platforms='any',\n    install_requires=REQUIRES,\n    test_suite='tests',\n    keywords=['bot', 'chatops'],\n    entry_points={\n        'console_scripts': [\n            'opsdroid = opsdroid.__main__:main'\n        ]\n    },\n)\n", "path": "setup.py"}], "after_files": [{"content": "#!/usr/bin/env python3\nimport os\nfrom setuptools import setup, find_packages\nfrom opsdroid.const import __version__\n\nPACKAGE_NAME = 'opsdroid'\nHERE = os.path.abspath(os.path.dirname(__file__))\n\nPACKAGES = find_packages(exclude=['tests', 'tests.*', 'modules',\n                                  'modules.*', 'docs', 'docs.*'])\n\nREQUIRES = [\n    'arrow==0.10.0',\n    'aiohttp==2.1.0',\n    'pycron==0.40',\n    'pyyaml==3.12'\n]\n\nsetup(\n    name=PACKAGE_NAME,\n    version=__version__,\n    license='GNU GENERAL PUBLIC LICENSE V3',\n    url='',\n    download_url='',\n    author='Jacob Tomlinson',\n    author_email='jacob@tom.linson.uk',\n    description='An open source chat-ops bot.',\n    packages=PACKAGES,\n    include_package_data=True,\n    zip_safe=False,\n    platforms='any',\n    install_requires=REQUIRES,\n    test_suite='tests',\n    keywords=['bot', 'chatops'],\n    entry_points={\n        'console_scripts': [\n            'opsdroid = opsdroid.__main__:main'\n        ]\n    },\n)\n", "path": "setup.py"}]}