Fix a typo, and update the filename of the whatsnew file (#217)

* Update 6.01.05.md and fixed typo

Author: MartenvanWezel

static_files/whats_new/5.10.16.md renamed to static_files/whats_new/6.01.05.md

@@ -20,7 +20,7 @@ In this version we have a lot for you to try.
 * [Google Classroom](https://edu.google.com/intl/en/products/classroom/?modal_active=none)
   Improvements (App only)
 
-  Does tour teacher have new assignments for you in
+  Does your teacher have new assignments for you in
   [Google Classroom](https://edu.google.com/intl/en/products/classroom/?modal_active=none)?
   You can now open them directly from the Coding with Chrome menu. Make sure
   you log in using the person icon in the upper right of Coding with Chrome to