bower.json: add missing aff dependency

Author: Hi-Angel

bower.json

@@ -16,6 +16,7 @@
     "package.json"
   ],
   "dependencies": {
+    "purescript-aff": "^7.0.0",
     "purescript-exceptions": "^6.0.0",
     "purescript-node-event-emitter": "https://github.com/purescript-node/purescript-node-event-emitter.git#^3.0.0",
     "purescript-foreign": "^7.0.0",