Bump minimum version of committee

https://github.com/willnet/committee-rails/blob/86d7a4b1bd47abc085fe7813d09480bc48342fb4/spec/lib/methods_spec.rb#L61 needs committee >= 4.4.0 .

ref: interagent/committee@9a388e5

README.md

@@ -17,6 +17,10 @@ And then execute:
 
     $ bundle
 
+If you use committee prior to 4.4.0, you have to use committee-rails 0.5.x. Please see below.
+
+[0.5 (0-5-stable) documentation](https://github.com/willnet/committee-rails/tree/0-5-stable)
+
 If you use committee prior to 3.0, you have to use committee-rails 0.4.x. Please see below.
 
 [0.4 (0-4-stable) documentation](https://github.com/willnet/committee-rails/tree/0-4-stable)

committee-rails.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
-  spec.add_dependency 'committee', '>= 3.0.0'
+  spec.add_dependency 'committee', '>= 4.4.0'
   spec.add_dependency 'activesupport'
   spec.add_dependency 'actionpack'
   spec.add_dependency 'railties'

lib/committee/rails/version.rb

@@ -1,5 +1,5 @@
 module Committee
   module Rails
-    VERSION = "0.5.1"
+    VERSION = "0.6.0"
   end
 end