Add StyleCI to check PSR-2 coding style

Author: peter279k

Diff for: .styleci.yml

@@ -0,0 +1 @@
+preset: psr2

Diff for: src/ImageConverter.php

@@ -86,8 +86,8 @@ private function saveImage($to, $image, $quality)
         }
 
 
-        if(isset($quality) && !is_int($quality)) {
-          throw new \InvalidArgumentException(sprintf('The %s quality has to be an integer', $quality));
+        if (isset($quality) && !is_int($quality)) {
+            throw new \InvalidArgumentException(sprintf('The %s quality has to be an integer', $quality));
         }
 
         switch ($extension) {
@@ -100,7 +100,7 @@ private function saveImage($to, $image, $quality)
                   throw new \InvalidArgumentException(sprintf('The %s quality is out of range', $quality));
               }
               $image = imagejpeg($image, $to, $quality);
-              break;          
+              break;
           case 'png':
               if ($quality < -1 && $quality > 9) {
                   throw new \InvalidArgumentException(sprintf('The %s quality is out of range', $quality));
@@ -179,7 +179,8 @@ private function makeDirectory($to)
  * @return resource
  * @throws \InvalidArgumentException
  */
-function convert($from, $to, $quality = null) {
-  $converter = new ImageConverter();
-  return $converter->convert($from, $to, $quality);
-}
+function convert($from, $to, $quality = null)
+{
+    $converter = new ImageConverter();
+    return $converter->convert($from, $to, $quality);
+}