Update README.md

Fixed wording in code style section

README.md

@@ -67,7 +67,7 @@ You can find out how to obtain a Google Maps API key [here](https://developer.xa
 
 ## Coding Style ##
 
-We follow the style used by the [.NET Foundation](https://github.com/dotnet/corefx/blob/master/Documentation/coding-guidelines/coding-style.md), with two primary exceptions:
+We follow the style used by the [.NET Foundation](https://github.com/dotnet/corefx/blob/master/Documentation/coding-guidelines/coding-style.md), with a few exceptions:
 
 - We do not use the `private` keyword as it is the default accessibility level in C#.
 - We use hard tabs over spaces. You can change this setting in VS 2015 via `Tools > Options` and navigating to `Text Editor > C#` and selecting the "Keep tabs" radio option. In Visual Studio for Mac it's set via preferences in `Source Code > Code Formatting > C# source code` and disabling the checkbox for `Convert tabs to spaces`.