Update dependencies to enable Greenkeeper 🌴 (#13)

* chore(package): update dependencies

* docs(readme): add Greenkeeper badge

Author: greenkeeper[bot]

README.md

@@ -1,5 +1,7 @@
 # textlint-rule-prh [![textlint rule](https://img.shields.io/badge/textlint-fixable-green.svg?style=social)](https://textlint.github.io/) [![Build Status](https://travis-ci.org/azu/textlint-rule-prh.svg?branch=master)](https://travis-ci.org/azu/textlint-rule-prh)
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/azu/textlint-rule-prh.svg)](https://greenkeeper.io/)
+
 [textlint](https://github.com/azu/textlint "textlint") rule for [prh/prh: proofreading helper](https://github.com/prh/prh "prh/prh: proofreading helper").
 
 This rule check the spell by used with `prh.yml`.

package.json

@@ -32,7 +32,7 @@
     "prh"
   ],
   "dependencies": {
-    "prh": "^1.0.1",
+    "prh": "^3.0.1",
     "textlint-rule-helper": "^2.0.0",
     "untildify": "^3.0.2"
   },
@@ -44,7 +44,7 @@
     "babel-register": "^6.7.2",
     "mocha": "^3.1.2",
     "power-assert": "^1.3.1",
-    "textlint": "^7.1.1",
+    "textlint": "^8.0.0",
     "textlint-tester": "^2.0.0"
   },
   "peerDependencies": {