Update doc to correct current version (#54)

* Update doc to correct current version
* Also add badge to make it easier to tell current version
* Remove JDK 7 from Travis tests

Closes #53

.travis.yml

@@ -2,7 +2,6 @@ sudo: false
 language: groovy
 jdk:
 - oraclejdk8
-- oraclejdk7
 script: ./grailsw refresh-dependencies && ./grailsw "test-app -coverage -xml"
 after_success:
 - ./grailsw coveralls

README.md

@@ -1,8 +1,9 @@
+[![Current Version](https://img.shields.io/badge/grails%20central-1.7.0-brightgreen.svg)](https://grails.org/plugin/recaptcha)
 [![Build Status](https://travis-ci.org/iamthechad/grails-recaptcha.svg?branch=version1_8_0)](https://travis-ci.org/iamthechad/grails-recaptcha)
 [![Coverage Status](https://coveralls.io/repos/iamthechad/grails-recaptcha/badge.svg?branch=version1_8_0&service=github)](https://coveralls.io/github/iamthechad/grails-recaptcha?branch=version1_8_0)
 [![Stories in Ready](https://badge.waffle.io/iamthechad/grails-recaptcha.png?label=ready&title=Ready)](https://waffle.io/iamthechad/grails-recaptcha)
 [![License](http://img.shields.io/:license-apache-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0.html)
-[![Badges](http://img.shields.io/:badges-5/5-ff6799.svg)](https://github.com/badges/badgerbadgerbadger)
+[![Badges](http://img.shields.io/:badges-6/6-ff6799.svg)](https://github.com/badges/badgerbadgerbadger)
 
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
@@ -61,7 +62,7 @@ Add the following to your `grails-app/conf/BuildConfig.groovy`
     …
     plugins {
         …
-        compile ':recaptcha:1.8.0'
+        compile ':recaptcha:1.7.0'
         …
     }