fixed encoding problem with some repositories

lib/git_stats/git_data/command_runner.rb

@@ -3,6 +3,11 @@ module GitStats
   module GitData
     class CommandRunner
       def run(path, command)
+        execute(command, path).encode!('UTF-8', 'UTF-8', :invalid => :replace)
+      end
+
+      private
+      def execute(command, path)
         Dir.chdir(path) { %x[#{command}] }
       end
     end