grammar quick fix

Author: koreissm

README.md

@@ -391,7 +391,7 @@ Inspired by [awesome-php](https://github.com/ziadoz/awesome-php).
 * [delorean](https://github.com/myusuf3/delorean/) - A library for clearing up the inconvenient truths that arise dealing with datetimes.
 * [moment](https://github.com/zachwill/moment) - A Python library for dealing with dates/times. Inspired by [Moment.js](http://momentjs.com/).
 * [Pendulum](https://github.com/sdispater/pendulum) - Python datetimes made easy.
-* [PyTime](https://github.com/shinux/PyTime) - An easy-use Python module which aims to operate date/time/datetime by string.
+* [PyTime](https://github.com/shinux/PyTime) - An easy-to-use Python module which aims to operate date/time/datetime by string.
 * [pytz](https://launchpad.net/pytz) - World timezone definitions, modern and historical. Brings the [tz database](https://en.wikipedia.org/wiki/Tz_database) into Python.
 * [when.py](https://github.com/dirn/When.py) - Providing user-friendly functions to help perform common date and time actions.
 * [maya](https://github.com/kennethreitz/maya) - Datetimes for Humans.