message: Re-add stable channel for AppVeyor
  Accidentally removed the old version - should have bumped rather than removed.
diff: environment:
  RUST_TEST_THREADS: 1
  matrix:
  + - TARGET: x86_64-pc-windows-msvc
  + RUST_CHANNEL: 1.27.1
  + WPD_LIB_PATH: "C:/dl/wpdpack/WpdPack/Lib/x64/Packet.lib"
  + VCVARS: "C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\bin\\amd64\\vcvars64.bat"
  + - TARGET: i686-pc-windows-msvc
  + RUST_CHANNEL: 1.27.1
  + WPD_LIB_PATH: "C:/dl/wpdpack/WpdPack/Lib/Packet.lib"
  + VCVARS: "C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\bin\\vcvars32.bat"
  - TARGET: x86_64-pc-windows-msvc
  RUST_CHANNEL: beta
  WPD_LIB_PATH: "C:/dl/wpdpack/WpdPack/Lib/x64/Packet.lib"
  