create class and implement encapsulation. This fix #34

lib/github_changelog_generator/generator.rb

@@ -0,0 +1,20 @@
+module GitHubChangelogGenerator
+  class Generator
+
+    def initialize(options)
+      @options = options
+    end
+
+    def get_string_for_pull_request(pull_request)
+      trimmed_title = pull_request[:title].gsub '>', '/>'
+      merge = "#{@options[:merge_prefix]}#{trimmed_title} [\\##{pull_request[:number]}](#{pull_request.html_url})"
+      if @options[:author]
+        merge += " ([#{pull_request.user.login}](#{pull_request.user.html_url}))\n\n"
+      else
+        merge += "\n\n"
+      end
+      merge
+    end
+
+  end
+end