[AppVeyor] Added -y to cinst. It is required by the next version of chocolatey.

appveyor.yml

@@ -35,7 +35,7 @@ install:
     - '%CYG_ROOT%/bin/bash -lc "godi_add godi-zip"'
     - 'set PATH=%PATH%;%CYG_ROOT%/opt/wodi%WODI_ARCH%/bin'
     # Install neko
-    - cinst make
+    - cinst make -y
     - 'git clone --recursive https://github.com/HaxeFoundation/neko.git %NEKO_ROOT%'
     - 'cd %NEKO_ROOT%'
     - set PATH=%PATH%;%NEKO_ROOT%/bin