Update appveyor.yml

Author: AtsushiSakai

appveyor.yml

@@ -5,8 +5,7 @@ environment:
     # See: http://stackoverflow.com/a/13751649/163740
     CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\appveyor\\run_with_env.cmd"
 
-
-  matrix:
+matrix:
 
   - PYTHON: "C:\\Python36-x64"
     PYTHON_VERSION: "3.6.x" # currently 3.6.5