fix(ci) fix for untrusted python certs (#434)

Author: Tieske

appveyor.yml

@@ -15,6 +15,8 @@ environment:
 
 before_build:
   - set PATH=C:\Python27\Scripts;%PATH%
+  - pip install --upgrade certifi
+  - FOR /F "tokens=* USEBACKQ" %%F IN (`python -c "import certifi;print(certifi.where())"`) DO ( SET SSL_CERT_FILE=%%F )
   - pip install hererocks
   - hererocks here --%LUA% -rlatest
   - call here\bin\activate