Fix github clone url

You cannot clone from github using http, you must use https.

README.rdoc

@@ -35,7 +35,7 @@ M&C is a Redmine Plugin used as a chart tool to monitoring issues' project
 * Copy or clone the app on Redmine plugin folder with the same name like: /vendor/plugins/redmine_monitoring_controlling
 
     cd /{redmineInstalationDir}/vendor/plugins
-    git clone http://github.com/alexmonteiro/Redmine-Monitoring-Controlling.git redmine_monitoring_controlling
+    git clone https://github.com/alexmonteiro/Redmine-Monitoring-Controlling.git redmine_monitoring_controlling
 
 * Run 
 	rake db:migrate_plugins to copy the assets.
@@ -50,4 +50,4 @@ Check {GNU GPL v3 quick guide}[http://www.gnu.org/licenses/quick-guide-gplv3.htm
 == Credits
 
 * Highcharts[http://www.highcharts.com/]: interactive javascript charts for your web projects;
-* Railscasts[http://railscasts.com/]: learn how to use highcharts on your rails app in #223[http://railscasts.com/episodes/223-charts] episode.
+* Railscasts[http://railscasts.com/]: learn how to use highcharts on your rails app in #223[http://railscasts.com/episodes/223-charts] episode.