Change dependency on oauth to peer and >=0.10.0

Workaround for jaredhanson/passport-google-oauth2#87

Author: paul-thompson-helix

package.json

@@ -38,11 +38,13 @@
   "main": "./lib",
   "dependencies": {
     "base64url": "3.x.x",
-    "oauth": "0.9.x",
     "passport-strategy": "1.x.x",
     "uid2": "0.0.x",
     "utils-merge": "1.x.x"
   },
+  "peerDependencies": {
+    "oauth": ">=0.10.0",
+  }
   "devDependencies": {
     "make-node": "0.4.6",
     "mocha": "2.x.x",