Bump gem version to 0.1.8

Author: joesiewert

lib/bitbucket_rest_api/version.rb

@@ -4,7 +4,7 @@ module BitBucket
   module VERSION
     MAJOR = 0
     MINOR = 1
-    PATCH = 7
+    PATCH = 8
 
     STRING = [MAJOR, MINOR, PATCH].compact.join('.')
   end