Restrict vsix to VS 2015 and later.

Author: rpaquay

src/VsChromium/source.extension.vsixmanifest

@@ -7,11 +7,11 @@
     <License>LICENSE</License>
   </Metadata>
   <Installation InstalledByMsi="false">
-    <InstallationTarget Id="Microsoft.VisualStudio.Pro" Version="[12.0,]" />
+    <InstallationTarget Id="Microsoft.VisualStudio.Pro" Version="[14.0,]" />
   </Installation>
   <Dependencies>
-    <Dependency Id="Microsoft.Framework.NDP" DisplayName="Microsoft .NET Framework" Version="[4.5,]" />
-    <Dependency Id="Microsoft.VisualStudio.MPF.12.0" DisplayName="Visual Studio MPF 12.0" d:Source="Installed" Version="[12.0,]" />
+    <Dependency Id="Microsoft.Framework.NDP" DisplayName="Microsoft .NET Framework" Version="[4.6,]" />
+    <Dependency Id="Microsoft.VisualStudio.MPF.14.0" DisplayName="Visual Studio MPF 12.0" d:Source="Installed" Version="[14.0,]" />
   </Dependencies>
   <Prerequisites>
      <Prerequisite Id="Microsoft.VisualStudio.Component.CoreEditor" Version="[15.0,]" DisplayName="Visual Studio core editor" />