Bump up gem version.

Author: gimite

google_drive.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name = 'google_drive'
-  s.version = '3.0.4'
+  s.version = '3.0.5'
   s.authors = ['Hiroshi Ichikawa']
   s.email = ['gimite+github@gmail.com']
   s.summary = 'A library to read/write files/spreadsheets in Google Drive/Docs.'