Apply fixes from StyleCI

Author: dbu

src/MimetypeHelper.php

@@ -12,7 +12,7 @@ interface MimetypeHelper
      *
      * @param string $filename
      *
-     * @return null|string
+     * @return string|null
      */
     public function getMimetypeFromFilename($filename);
 

src/MultipartStreamBuilder.php

@@ -143,10 +143,9 @@ public function build()
     /**
      * Add extra headers if they are missing.
      *
-     * @param string          $name
-     * @param StreamInterface $stream
-     * @param string          $filename
-     * @param array           &$headers
+     * @param string $name
+     * @param string $filename
+     * @param array  &$headers
      */
     private function prepareHeaders($name, StreamInterface $stream, $filename, array &$headers)
     {
@@ -178,8 +177,6 @@ private function prepareHeaders($name, StreamInterface $stream, $filename, array
     /**
      * Get the headers formatted for the HTTP message.
      *
-     * @param array $headers
-     *
      * @return string
      */
     private function getHeaders(array $headers)
@@ -195,8 +192,7 @@ private function getHeaders(array $headers)
     /**
      * Check if header exist.
      *
-     * @param array  $headers
-     * @param string $key     case insensitive
+     * @param string $key case insensitive
      *
      * @return bool
      */
@@ -253,8 +249,6 @@ private function getMimetypeHelper()
     /**
      * If you have custom file extension you may overwrite the default MimetypeHelper with your own.
      *
-     * @param MimetypeHelper $mimetypeHelper
-     *
      * @return MultipartStreamBuilder
      */
     public function setMimetypeHelper(MimetypeHelper $mimetypeHelper)