add needed depensencies for circle cli for ruby v2 errors (#203)

Author: butlerx

circle.yml

@@ -5,6 +5,8 @@ machine:
     LANG: en_US.utf8
 dependencies:
   pre:
+    - gem install mime-types -v 2.6.2
+    - gem install rest-client -v 1.8
     - gem install crowdin-cli
     - crowdin-cli upload sources
     - for lang in it pt-PT de nl ro mt sl sk fr uk es-ES es-AR el pl et bg tr ja hi lt; do crowdin-cli download -l $lang; done