Fix: composer.json - clue/stream-filter version

* clue/stream-filter version should update to 1.4.1. 

*Problem:* if you use "php-http/message" several time on a package it will call "clue/stream-filter" several time. On their previous version before 1.4.1 they didn't have the duplicate function checking. So, it will create same namespace several time. 

*Real Life Example:*  "php-http/message" has been used in - (infusionsoft/php-sdk)[https://github.com/infusionsoft/infusionsoft-php] 
if you create several wordpress plugins with - infusionsoft/php-sdk and install all the plugins in same website then "php-http/message" will be called several time so the "clue/stream-filter". Which create error for using same namespace.

composer.json

@@ -16,7 +16,7 @@
     ],
     "require": {
         "php": "^7.1",
-        "clue/stream-filter": "^1.4",
+        "clue/stream-filter": "^1.4.1",
         "php-http/message-factory": "^1.0.2",
         "psr/http-message": "^1.0"
     },