Use Tx 0.7.1

Author: paf31

bower.json

@@ -22,7 +22,7 @@
     "url": "git://github.com/purescript-contrib/purescript-parsing.git"
   },
   "dependencies": {
-    "purescript-transformers": "^0.7.0",
+    "purescript-transformers": "^0.7.1",
     "purescript-either": "^0.2.0",
     "purescript-identity": "^0.4.0",
     "purescript-maybe": "^0.3.0",