rb - update firefox_options for geckodriver 0.11

Author: titusfortner

rb/CHANGES

@@ -1,7 +1,8 @@
-3.0.0 (2016-10-11)
+3.0.0 (2016-10-13)
 ===================
 
-No Ruby changes in this release
+Firefox:
+  * Update :firefox_options support for geckodriver 0.11
 
 3.0.0.beta4 (2016-09-29)
 ===================

rb/lib/selenium/webdriver/remote/w3c_capabilities.rb

@@ -190,6 +190,8 @@ def as_json(*)
               hash['platform'] = value.to_s.upcase
             when :proxy
               hash['proxy'] = value.as_json if value
+            when :firefox_options
+              hash['moz:firefoxOptions'] = value
             when String, :firefox_binary
               hash[key.to_s] = value
             when Symbol