Minimize appveyor logs

Author: AArnott

appveyor.yml

@@ -1,14 +1,13 @@
-version: 99.0.{build}
+version: '{build}'
 skip_tags: true
 image: Visual Studio 2017
 configuration: Release
+before_build:
+- |- # Restore TWICE. See https://github.com/AArnott/Nerdbank.GitVersioning/issues/113#issuecomment-285903085
+  msbuild src\CodeGeneration.Roslyn.sln /nologo /m /v:quiet /t:restore > nul
+  msbuild src\CodeGeneration.Roslyn.sln /nologo /m /v:quiet /t:restore
 build_script:
-- ps: >-
-    msbuild src\CodeGeneration.Roslyn.sln /nologo /m /t:restore
-
-    msbuild src\CodeGeneration.Roslyn.sln /nologo /m /t:restore
-
-    msbuild src\CodeGeneration.Roslyn.sln /nologo /m /t:build,pack
+- msbuild src\CodeGeneration.Roslyn.sln /nologo /m /v:minimal /t:build,pack
 artifacts:
 - path: bin\**\*.nupkg
   name: NuGet Package