We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Update CHANGELOG for 0.7.x
## 🐛 Bug

<!-- A clear and concise description of what the bug is. -->

Updated CHANGELOG according to the reset changes (about last two weeks) especially deprecated items like `data_loader` or `xxxxx_end`

### Additional context

<!-- Add any other context about the problem here. -->

https://github.com/PyTorchLightning/pytorch-lightning/milestone/4

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `pytorch_lightning/core/decorators.py`
Content:
```
1 import traceback
2 from functools import wraps
3 import warnings
4 
5 
6 def data_loader(fn):
7     """Decorator to make any fx with this use the lazy property.
8 
9     :param fn:
10     :return:
11     """
12     w = 'data_loader decorator deprecated in 0.7.0. Will remove 0.9.0'
13     warnings.warn(w)
14 
15     def inner_fx(self):
16         return fn(self)
17     return inner_fx
18
```
--- 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/pytorch_lightning/core/decorators.py b/pytorch_lightning/core/decorators.py
--- a/pytorch_lightning/core/decorators.py
+++ b/pytorch_lightning/core/decorators.py
@@ -6,11 +6,10 @@
 def data_loader(fn):
     """Decorator to make any fx with this use the lazy property.
 
-    :param fn:
-    :return:
+    Warnings:
+        This decorator deprecated in v0.7.0 and it will be removed v0.9.0.
     """
-    w = 'data_loader decorator deprecated in 0.7.0. Will remove 0.9.0'
-    warnings.warn(w)
+    warnings.warn('`data_loader` decorator deprecated in v0.7.0. Will be removed v0.9.0', DeprecationWarning)
 
     def inner_fx(self):
         return fn(self)

{"golden_diff": "diff --git a/pytorch_lightning/core/decorators.py b/pytorch_lightning/core/decorators.py\n--- a/pytorch_lightning/core/decorators.py\n+++ b/pytorch_lightning/core/decorators.py\n@@ -6,11 +6,10 @@\n def data_loader(fn):\n     \"\"\"Decorator to make any fx with this use the lazy property.\n \n-    :param fn:\n-    :return:\n+    Warnings:\n+        This decorator deprecated in v0.7.0 and it will be removed v0.9.0.\n     \"\"\"\n-    w = 'data_loader decorator deprecated in 0.7.0. Will remove 0.9.0'\n-    warnings.warn(w)\n+    warnings.warn('`data_loader` decorator deprecated in v0.7.0. Will be removed v0.9.0', DeprecationWarning)\n \n     def inner_fx(self):\n         return fn(self)\n", "issue": "Update CHANGELOG for 0.7.x\n## \ud83d\udc1b Bug\r\n\r\n<!-- A clear and concise description of what the bug is. -->\r\n\r\nUpdated CHANGELOG according to the reset changes (about last two weeks) especially deprecated items like `data_loader` or `xxxxx_end`\r\n\r\n### Additional context\r\n\r\n<!-- Add any other context about the problem here. -->\r\n\r\nhttps://github.com/PyTorchLightning/pytorch-lightning/milestone/4\n", "before_files": [{"content": "import traceback\nfrom functools import wraps\nimport warnings\n\n\ndef data_loader(fn):\n    \"\"\"Decorator to make any fx with this use the lazy property.\n\n    :param fn:\n    :return:\n    \"\"\"\n    w = 'data_loader decorator deprecated in 0.7.0. Will remove 0.9.0'\n    warnings.warn(w)\n\n    def inner_fx(self):\n        return fn(self)\n    return inner_fx\n", "path": "pytorch_lightning/core/decorators.py"}], "after_files": [{"content": "import traceback\nfrom functools import wraps\nimport warnings\n\n\ndef data_loader(fn):\n    \"\"\"Decorator to make any fx with this use the lazy property.\n\n    Warnings:\n        This decorator deprecated in v0.7.0 and it will be removed v0.9.0.\n    \"\"\"\n    warnings.warn('`data_loader` decorator deprecated in v0.7.0. Will be removed v0.9.0', DeprecationWarning)\n\n    def inner_fx(self):\n        return fn(self)\n    return inner_fx\n", "path": "pytorch_lightning/core/decorators.py"}]}