version bump

Gemfile.lock

 PATH
   remote: .
   specs:
-    steem-ruby (0.1.1)
+    steem-ruby (0.9.0)
       bitcoin-ruby (~> 0.0, >= 0.0.18)
       ffi (~> 1.9, >= 1.9.23)
       hashie (~> 3.5, >= 3.5.7)

lib/steem/version.rb

 module Steem
-  VERSION = '0.1.1'
+  VERSION = '0.9.0'
   AGENT_ID = "steem-ruby/#{VERSION}"
 end