f-string formatting
CONTRIBUTOR
Hello @lhoestq, ```make style``` is applied as asked. :)
2021-11-16T21:05:35Z
https://github.com/huggingface/datasets/pull/3277#issuecomment-970678186
https://api.github.com/repos/huggingface/datasets/issues/3277
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2021-11-16T21:05:35Z
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**Fix #3257**

Replaced _.format()_ and _%_ by f-strings in the following modules : 
- [x] **tests**
- [x] **metrics**
- [x] **benchmarks**
- [x] **utils**
- [x] **templates**
- [x] **src/Datasets/\*.py**

Modules in **_src/Datasets/_**: 
- [x] **commands**
- [x] **features**
- [x] **formatting**
- [x] **io**
- [x] **tasks**
- [x] **utils**


Module **datasets** will not be edited as asked by @mariosasko 

-A correction of the first PR (#3267)-
