Grammatically update the readme file
Small grammatical update the readme file 
Thanks @mohamed-khoualed - some of these aren't correct (e.g. "Here are just a few of the things that pandas do well", the current phrasing with "does" is fine as it is), I'm not sure this is an improvement, and some of the linting checks are broken

Instead of trying to change the README, why not try tackling on of the many [good first issue](https://github.com/pandas-dev/pandas/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22)s? See [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html) for how to contribute, and feel free to reach out on Gitter if you have trouble getting set up