bump requirejs to 2.2

Author: minrk

bower.json

@@ -19,7 +19,7 @@
     "preact": "https://unpkg.com/preact@^7.2.0/dist/preact.min.js",
     "preact-compat": "https://unpkg.com/preact-compat@^3.14.3/dist/preact-compat.min.js",
     "proptypes": "https://unpkg.com/proptypes@^0.14.4/index.js",
-    "requirejs": "~2.1",
+    "requirejs": "~2.2",
     "requirejs-text": "~2.0.15",
     "requirejs-plugins": "~1.0.3",
     "text-encoding": "~0.1",