Updated NuSpec & Readme for .NET Standard 1.0 support

Author: TheCodeTraveler

README.md

@@ -43,7 +43,7 @@ Available on NuGet: https://www.nuget.org/packages/AsyncAwaitBestPractices/
 ### AsyncAwaitBestPractices.MVVM
 
 - Available on NuGet: https://www.nuget.org/packages/AsyncAwaitBestPractices.MVVM/  
-- Add to any project supporting .NET Standard 2.0
+- Add to any project supporting .NET Standard 1.0
 
 ## Why Do I Need This?
 

Src/AsyncAwaitBestPractices.MVVM.nuspec

@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
   <metadata minClientVersion="2.5">
     <id>AsyncAwaitBestPractices.MVVM</id>
-    <version>3.1.0-pre3</version>
+    <version>3.1.0-pre4</version>
     <title>Task Extensions for MVVM</title>
     <authors>Brandon Minnick, John Thiriet</authors>
     <owners>Brandon Minnick</owners>