release: remove merge override

FEATURE.md

@@ -79,12 +79,6 @@ Use the `merge` subcommand to merge your feature branch changes to the standard
 feature merge
 ```
 
-You can also override the default standard branch by specifying another branch.
-
-```
-feature merge integration
-```
-
 #### End
 
 Use the `end` subcommand to safely close out the feature.

lib/feature/merge.rb

@@ -4,11 +4,11 @@ module Feature
 
   class Merge < Feature::Base
     def valid?
-      [1,2].include? argv.size
+      [1].include? argv.size
     end
 
     def help
-      "feature merge [branch]"
+      "feature merge"
     end
 
     def execute