update readme

Author: lonelyenvoy

README.md

@@ -85,6 +85,7 @@ TypeError: unhashable type: 'list'
 pip install memoization
 ```
 
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 ## Usage in 2 lines
 
 ```python
@@ -177,12 +178,14 @@ With ```cache_info```, you can retrieve the number of ```hits``` and ```misses``
 - Access the original function ```f``` by ```f.__wrapped__```.
 - Clear the cache by ```f.cache_clear()```.
 
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 ## Contributing
 
 This project welcomes contributions from anyone.
 - [Submit bugs](https://github.com/lonelyenvoy/python-memoization/issues) and help me verify fixes.
 - [Submit pull requests](https://github.com/lonelyenvoy/python-memoization/pulls) for bug fixes and features and discuss existing proposals. Please make sure that your PR passes the tests in ```test.py```.
 
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 ## License
 
 [The MIT License](https://github.com/lonelyenvoy/python-memoization/blob/master/LICENSE)