bug fix

Author: adityapatadia

lib/ImageResize.php

@@ -112,7 +112,7 @@ public function __construct($filename)
         $finfo = finfo_open(FILEINFO_MIME_TYPE);
         $checkWebp = false;
         if (strstr(finfo_file($finfo, $filename), 'image') === false) {
-            if (version_compare(PHP_VERSION, '5.6.0', '<=')) {
+            if (version_compare(PHP_VERSION, '7.0', '<=')) {
                 if (strstr(file_get_contents($filename), 'WEBPVP8') !== false) {
                     $checkWebp = true;
                     $this->source_type = IMAGETYPE_WEBP;