Update manifest for VS2019 support

[essenbee]

I have updated the VSIX manifest so that the extension can be installed into VS 2019, as per Issue #27.

[ilanmog]

you should also change tfs dll ref for example - I changed it as follows: <Reference Include="Microsoft.TeamFoundation.Client, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>..............\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\Microsoft.TeamFoundation.Client.dll</HintPath> </Reference> <Reference Include="Microsoft.TeamFoundation.VersionControl.Client, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>..............\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\Microsoft.TeamFoundation.VersionControl.Client.dll</HintPath> </Reference> <Reference Include="Microsoft.TeamFoundation.VersionControl.Common, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>..............\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\Microsoft.TeamFoundation.VersionControl.Common.dll</HintPath> </Reference> <Reference Include="Microsoft.TeamFoundation.VersionControl.ControlAdapter"> <HintPath>..............\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\Microsoft.TeamFoundation.VersionControl.ControlAdapter.dll</HintPath> </Reference> <Reference Include="Microsoft.TeamFoundation.VersionControl.Controls"> <HintPath>..............\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\Microsoft.TeamFoundation.VersionControl.Controls.dll</HintPath> </Reference> <Reference Include="Microsoft.TeamFoundation.WorkItemTracking.Client, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>..............\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\Microsoft.TeamFoundation.WorkItemTracking.Client.dll</HintPath> </Reference>