chore(common): update common version

Author: kevinkowa

src/IBM.Watson.Common/IBM.Watson.Common.csproj

@@ -10,7 +10,7 @@
         <PackageTags>watson;cognitive;speech;vision;machine-learning;ml;ai;artificial-intelligence;.NET;.NET-Standard</PackageTags>
         <PackageIconUrl>https://watson-developer-cloud.github.io/dotnet-standard-sdk/img/Watson_Avatar_Pos_RGB.png</PackageIconUrl>
         <PackageProjectUrl>https://github.com/watson-developer-cloud/dotnet-standard-sdk</PackageProjectUrl>
-        <Version>5.3.0</Version>
+        <Version>6.0.0</Version>
     </PropertyGroup>
 
     <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">