Remove rogue quote

Author: RehanSaeed

appveyor.yml

@@ -33,7 +33,7 @@ artifacts:
 - name: NuGet Packages
   path: ./Artifacts/**/*.nupkg
 - name: NuGet Symbol Packages
-  path: ./Artifacts/**/*.snupkg'
+  path: ./Artifacts/**/*.snupkg
 - name: xUnit Test Results
   path: ./Artifacts/**/*.xml