fix package author attribute (#412)

Common/build.props

@@ -3,7 +3,7 @@
   <Import Project="version.props"/>
   <PropertyGroup>
     <Product>Coyote</Product>
-    <Authors>Microsoft Corporation</Authors>
+    <Authors>Microsoft</Authors>
     <Company>Microsoft Corporation</Company>
     <Copyright>Copyright © Microsoft Corporation. All rights reserved.</Copyright>
     <RepositoryUrl>https://github.com/microsoft/coyote</RepositoryUrl>