Add command line option to print version

bin/git-cleanup

@@ -15,6 +15,10 @@ opts = OptionParser.new do |opts|
 	opts.on("-s", "--skip-unmerged", "Unmerge branches will be skipped") do |u|
 		conf[:skip_unmerged] = true
 	end
+  opts.on("-v", "--version", "Shows version") do
+    puts GitCleanup::VERSION
+    exit
+  end
 	opts.on("-h", "--help", "Shows this help") do
     puts opts
     exit

git-cleanup.gemspec

@@ -1,9 +1,10 @@
 # -*- encoding: utf-8 -*-
 $:.push File.expand_path("../lib", __FILE__)
+require "git-cleanup/version"
 
 Gem::Specification.new do |s|
   s.name        = "git-cleanup"
-  s.version     = "0.1.3"
+  s.version     = GitCleanup::VERSION
   s.platform    = Gem::Platform::RUBY
   s.authors     = ["Martyn Loughran"]
   s.email       = ["me@mloughran.com"]

lib/git-cleanup.rb

@@ -94,3 +94,4 @@ def self.prune(repo)
 
 require 'git-cleanup/branch'
 require 'git-cleanup/helper'
+require 'git-cleanup/version'

lib/git-cleanup/version.rb

@@ -0,0 +1,3 @@
+class GitCleanup
+  VERSION = "0.1.3"
+end