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",

test/Main.purs

@@ -72,6 +72,7 @@ spawnLs = do
     Normally 0 -> log $ "ls exited with 0"
     Normally i -> liftEffect $ throw $ "ls had non-zero exit: " <> show i
     BySignal sig -> liftEffect $ throw $ "ls exited with sig: " <> show sig
+    BySysError -> liftEffect $ throw "ls exited with system error"
 
 nonExistentExecutable :: Aff Unit
 nonExistentExecutable = do