Merge pull request #128 from dellis1972/bumpitybump

Bump LibZipSharp and Mono.Unix to latest stable versions,

Author: grendello

src/Microsoft.Android.Build.BaseTasks/MSBuildReferences.projitems

@@ -5,8 +5,8 @@
   <!--Import this file in projects needing to reference Microsoft.Build.*.dll -->
   <PropertyGroup>
     <MSBuildPackageReferenceVersion>16.10.0</MSBuildPackageReferenceVersion>
-    <LibZipSharpVersion>2.0.0-alpha8</LibZipSharpVersion>
-    <MonoUnixVersion>7.0.0-alpha8.21302.6</MonoUnixVersion>
+    <LibZipSharpVersion>2.0.0</LibZipSharpVersion>
+    <MonoUnixVersion>7.0.0-final.1.21369.2</MonoUnixVersion>
   </PropertyGroup>
 
   <ItemGroup>