docs(uninstall): add a reminder to uninstall the web watcher too (#116)

Author: icemtel

src/uninstalling.rst

@@ -1,12 +1,13 @@
 Uninstalling
 ============
 
-Uninstalling ActivityWatch should be straight forward
+Uninstalling ActivityWatch should be straight forward.
 
 If you've installed using an installer (Windows) you should be able to uninstall it like any other Windows application (through the 'Programs and Features' section in the Control Panel).
 
-If you've installed by extracting a folder (Windows/Linux) or ``.app`` bundle (on macOS) then you can simply remove.
+If you've installed by extracting a folder (Windows/Linux) or ``.app`` bundle (on macOS) then you can simply remove it.
 
+After uninstalling, remember to remove or disable the web plugin as well. 
 
 Removing data
 -------------