Issue/327 versioning (#345)

* Switch to semver format

* Rewrite new version check to use Github Releases and cron

* Styling

* Remove v from in front of version

* New version check test fix

* Uncomment test case

app/Support/Http.php

@@ -20,7 +20,7 @@ class Http
      *
      * @return string
      */
-    public static function get($uri, array $opts)
+    public static function get($uri, array $opts = [])
     {
         $opts = array_merge([
             'connect_timeout' => 2, // wait two seconds by default