Modified how to install section

Changed the tense now that one can use Alcatraz to install the plugin
and also made it clear that you have to restart Xcode even when using
the plugin manager.

README.md

@@ -14,11 +14,11 @@ If you click on the color then a color picker is displayed.  As you choose colou
 This project was inspired from [Color Sense for Xcode](https://github.com/omz/ColorSense-for-Xcode).  In fact it looks (and I think it behaves mostly) like it.  But I built it completely from scratch in Swift though I did use that project as a template for some items as I haven't done anything on the Mac side before.  
 
 # Installing
-There will be three ways to install the plugin.
+There are three ways to install the plugin.
 
 1. Download the code and build it.  Xcode will install the plugin in the right directory.  Restart Xcode.
 2. Download the plugin and place it in the ~/Library/Application Support/Developer/Shared/Xcode/Plug-ins directory.  Restart Xcode.
-3. Use the plugin [Alcatraz](http://alcatraz.io) to install.
+3. Use the plugin [Alcatraz](http://alcatraz.io) to install and then restart Xcode.
 
 # Why rewrite?