Update CONTRIBUTING.md

Co-Authored-By: alexcjohnson <johnson.alex.c@gmail.com>

Author: byronz

CONTRIBUTING.md

@@ -27,7 +27,7 @@ $ pip list | grep dash
 
 `Dash Renderer` began as a separate repository. It was merged into the main  `Dash` repository as part of the 1.0 release. It is the common frontend for all Dash backends (**R** and **Python**), and manages React Component layout and backend event handling.
 
-If you want to contribute or simply dig deeper into Dash. We encourage you to play and taste it. This is the most efficient way to learn and understand everything under the hood.
+If you want to contribute or simply dig deeper into Dash, we encourage you to play and taste it. This is the most efficient way to learn and understand everything under the hood.
 
 For contributors who have purely  **Python**  or  **R**  background. This section might help you understand more details about developing and debugging in Javascript world.