Bump up minimum requirements

Author: unreal4u

composer.json

@@ -19,7 +19,7 @@
     "react/http-client": "^0.5",
     "react/promise": "^2.5",
     "clue/block-react": "^1.1",
-    "yoshi2889/multipart-builder": "^0.1"
+    "yoshi2889/multipart-builder": "^0.1.1"
   },
   "require-dev": {
     "monolog/monolog": "^1.17",