message: appveyor: try to fix reference not found
diff: @@ -33,7 +33,7 @@ clone_folder: C:\dronecore
  before_build:
  - cd C:\dronecore
  - - git submodule update --init --recursive --depth 20
  + - git submodule update --init --recursive --depth 100
  - cd C:\
  - appveyor DownloadFile https://curl.haxx.se/download/curl-7.56.1.zip
  - 7z x -y curl-7.56.1.zip
  