Set version to 3.1.0-rc.1

Author: mynetx

bower.json

@@ -1,6 +1,6 @@
 {
   "name": "codebird-php",
-  "version": "3.1.0-dev",
+  "version": "3.1.0-rc.1",
   "homepage": "https://www.jublo.net/projects/codebird/php",
   "authors": [
     "Joshua Atkins <joshua.atkins@jublo.net>",

src/codebird.php

@@ -6,7 +6,7 @@
  * A Twitter library in PHP.
  *
  * @package   codebird
- * @version   3.1.0-dev
+ * @version   3.1.0-rc.1
  * @author    Jublo Solutions <support@jublo.net>
  * @copyright 2010-2016 Jublo Solutions <support@jublo.net>
  * @license   https://opensource.org/licenses/GPL-3.0 GNU General Public License 3.0
@@ -508,7 +508,7 @@ class Codebird
   /**
    * The current Codebird version
    */
-  protected static $_version = '3.1.0-dev';
+  protected static $_version = '3.1.0-rc.1';
 
   /**
    * The Request or access token. Used to sign requests