Update appveyor.yml

Author: AtsushiSakai

appveyor.yml

@@ -5,10 +5,10 @@ environment:
     # See: http://stackoverflow.com/a/13751649/163740
     CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\appveyor\\run_with_env.cmd"
 
-matrix:
-  - PYTHON: "C:\\Python36-x64"
-    PYTHON_VERSION: "3.6.x" # currently 3.6.5
-    PYTHON_ARCH: "64"
+  matrix:
+    - PYTHON: "C:\\Python36-x64"
+      PYTHON_VERSION: "3.6.x" # currently 3.6.5
+      PYTHON_ARCH: "64"
 
 init:
   - "ECHO %MINICONDA% %PYTHON_VERSION% %PYTHON_ARCH%"