Finish the 2.1.1 patch release

Author: natemcmaster

README.md

@@ -27,7 +27,7 @@ $ dotnet add package McMaster.Extensions.CommandLineUtils
 ```
 ```xml
 <ItemGroup>
-  <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="2.1.0" />
+  <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="2.1.1" />
 </ItemGroup>
 ```
 

version.props

@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <VersionPrefix>2.1.1</VersionPrefix>
-    <VersionSuffix>alpha</VersionSuffix>
+    <VersionSuffix>rtm</VersionSuffix>
     <PackageVersion Condition="'$(APPVEYOR_REPO_TAG)' == 'true' AND '$(VersionSuffix)' != ''">$(VersionPrefix)-$(VersionSuffix)</PackageVersion>
     <PackageVersion Condition="'$(APPVEYOR_REPO_TAG)' == 'true' AND '$(VersionSuffix)' == 'rtm'">$(VersionPrefix)</PackageVersion>