Update composer.json

composer.json

@@ -3,7 +3,7 @@
     "description": "jquery.inputmask is a jquery plugin which create an input mask.",
 	"version": "3.1.57",
     "type": "library",
-    "keywords": ["jQuery", "plugins", "input", "form", "inputmask", "mask"],
+    "keywords": ["jquery", "plugins", "input", "form", "inputmask", "mask"],
     "homepage": "http://robinherbots.github.io/jquery.inputmask",
     "license": "MIT",
     "authors": [