- add explicit return types to avoid deprecations alerts on sf5.4

Author: maikelohcfg

src/Uploadable/MimeTypeGuesserAdapter.php

@@ -7,6 +7,10 @@
 
 class MimeTypeGuesserAdapter implements MimeTypeGuesserInterface
 {
+    /**
+     * @param $filePath
+     * @return ?string
+     */
     public function guess($filePath)
     {
         return MimeTypes::getDefault()->guessMimeType($filePath);

src/Uploadable/UploadedFileInfo.php

@@ -14,33 +14,50 @@ public function __construct(UploadedFile $uploadedFile)
         $this->uploadedFile = $uploadedFile;
     }
 
+    /**
+     * @return ?string
+     */
     public function getTmpName()
     {
         return $this->uploadedFile->getPathname();
     }
 
+    /**
+     * @return ?string
+     */
     public function getName()
     {
         return $this->uploadedFile->getClientOriginalName();
     }
 
+    /**
+     * @return ?string
+     */
     public function getSize()
     {
         return $this->uploadedFile->getSize();
     }
 
+    /**
+     * @return ?string
+     */
     public function getType()
     {
         return $this->uploadedFile->getMimeType();
     }
 
+    /**
+     * @return int
+     */
     public function getError()
     {
         return $this->uploadedFile->getError();
     }
 
     /**
      * {@inheritDoc}
+     *
+     * @return bool
      */
     public function isUploadedFile()
     {