Update version to 2.2.0

Update version to 2.2.0.
Relates to #344.

Author: martincostello

build/version.props

@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <VersionPrefix>2.1.1</VersionPrefix>
+    <VersionPrefix>2.2.0</VersionPrefix>
     <VersionSuffix>preview</VersionSuffix>
     <VersionSuffix Condition=" '$(VersionSuffix)' != '' AND '$(BuildNumber)' != '' ">$(VersionSuffix)-$(BuildNumber)</VersionSuffix>
   </PropertyGroup>