Merge pull request #3 from FoamyGuy/install_command

fix circup install command

Author: dhalbert

README.rst

@@ -81,7 +81,7 @@ following command to install:
 
 .. code-block:: shell
 
-    circup install ticks
+    circup install adafruit_ticks
 
 Or the following command to update an existing version: