Add 'fsharp-analyzer' to the NuGet package tags (#93)

refs ionide/FSharp.Analyzers.SDK#43 (comment)

Author: Numpsy

Directory.Build.props

@@ -11,7 +11,7 @@
             F# analyzers used within G-Research.
         </Description>
         <Copyright>Copyright G-Research © $([System.DateTime]::UtcNow.Year)</Copyright>
-        <PackageTags>F#, fsharp, analyzers</PackageTags>
+        <PackageTags>F#, fsharp, analyzers, fsharp-analyzer</PackageTags>
         <EmbedUntrackedSources>true</EmbedUntrackedSources>
         <PublishRepositoryUrl>true</PublishRepositoryUrl>
         <DebugType>embedded</DebugType>