add version bounds

Author: jdegoes

bower.json

@@ -12,11 +12,11 @@
     "dist"
   ],
   "dependencies": {
-    "purescript-control": "*",
-    "purescript-either": "*",
+    "purescript-control": "~0.2.1",
+    "purescript-either": "~0.1.3",
     "purescript-exists": "*",
-    "purescript-transformers": "*",
-    "purescript-lazy": "*",
-    "purescript-foldable-traversable": "*"
+    "purescript-transformers": "~0.2.0",
+    "purescript-lazy": "~0.1.0",
+    "purescript-foldable-traversable": "~0.1.3"
   }
 }