Make artifcats on windows. Minor fix

appveyor.yml

@@ -11,5 +11,5 @@ init:
 build_script:
 - cmd: call test.bat %platform%
 artifacts:
- - path c:\projects\sentencepiece\build\sentencepiece*.exe
- - path c:\projects\sentencepiece\build\sentencepiece*.zip
+ - path: c:\projects\sentencepiece\build\sentencepiece*.exe
+ - path: c:\projects\sentencepiece\build\sentencepiece*.zip