Gemfile in key_tree-0.3.0 vs Gemfile in key_tree-0.3.1

@@ -1,6 +1,12 @@
 source 'https://rubygems.org'
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
-# Specify your gem's dependencies in key_tree.gemspec
-gemspec
+begin
+  require 'git-version-bump'
+rescue LoadError
+  gem 'git-version-bump', '~> 0.15'
+else
+  # Specify your gem's dependencies in key_tree.gemspec
+  gemspec
+end