Change build step order

Author: thompson-tomo

appveyor.yml

@@ -10,11 +10,11 @@ skip_commits:
   files:
     - LICENSE
 install:
-- git submodule update --init
-- dotnet build -c Release src/SkyApm.Transport.Protocol
 - ps: |
     Invoke-WebRequest -Uri 'https://dot.net/v1/dotnet-install.ps1' -UseBasicParsing -OutFile "$env:temp\dotnet-install.ps1"
     & $env:temp\dotnet-install.ps1 -Architecture x64 -Version '5.0.408' -InstallDir "$env:ProgramFiles\dotnet"
+- git submodule update --init
+- dotnet build -c Release src/SkyApm.Transport.Protocol
 build_script:
 - ps: ./scripts/build.ps1
 artifacts: