Use new plugin syntax.

build.gradle

@@ -1,6 +1,10 @@
+plugins {
+  id 'com.dmdirc.git-version' version '1.0'
+  id 'com.github.kt3k.coveralls' version '2.1.0'
+}
+
 group = 'com.dmdirc'
 
-apply plugin: 'com.dmdirc.git-version'
 apply plugin: 'maven-publish'
 apply plugin: 'java'
 apply plugin: 'findbugs'
@@ -73,19 +77,6 @@ apply from: 'gradle/publishing.gradle'
 apply from: 'gradle/jar.gradle'
 apply from: 'gradle/fatjar.gradle'
 
-buildscript {
-    repositories {
-        mavenCentral()
-        maven { url 'http://artifactory.dmdirc.com/artifactory/repo' }
-        maven { url 'https://dl.bintray.com/dmdirc/releases/' }
-    }
-
-    dependencies {
-        classpath group: 'com.dmdirc', name: 'git-version', version: '1.0'
-        classpath 'org.kt3k.gradle.plugin:coveralls-gradle-plugin:2.1.0'
-    }
-}
-
 task wrapper(type: Wrapper) {
     gradleVersion = '2.2.1'
 }