fixing problem with php 5.6

Author: adityapatadia

lib/ImageResize.php

@@ -112,12 +112,9 @@ public function __construct($filename)
         $finfo = finfo_open(FILEINFO_MIME_TYPE);
         $checkWebp = false;
         if (strstr(finfo_file($finfo, $filename), 'image') === false) {
-            if (version_compare(PHP_VERSION, '7.1', '<')) {
-                if (strstr(file_get_contents($filename), 'WEBPVP8') !== false) {
-                    $checkWebp = true;
-                    $this->source_type = IMAGETYPE_WEBP;
-                }
-
+            if (version_compare(PHP_VERSION, '7.1', '<') && strstr(file_get_contents($filename), 'WEBPVP8') !== false) {
+                $checkWebp = true;
+                $this->source_type = IMAGETYPE_WEBP;
             } else {
                 throw new ImageResizeException('Unsupported file type');
             }