Use versioning plugin

build.gradle

@@ -1,15 +1,15 @@
 plugins {
     id 'signing'
     id 'com.jfrog.bintray' version '1.8.1'
+    id 'com.widen.versioning' version '0.3.1'
 }
 
 allprojects {
     apply plugin: 'groovy'
     apply plugin: 'java'
     apply plugin: 'maven-publish'
 
-    group 'com.widen.oss'
-    version '0.1.1'
+    group = 'com.widen.oss'
 
     sourceCompatibility = 1.8
     targetCompatibility = 1.8
@@ -23,14 +23,14 @@ allprojects {
         key = findProperty('bintrayApiKey') ?: System.getenv('BINTRAY_KEY')
     }
 
-    task javadocJar(type: Jar) {
-        classifier = 'javadoc'
-        from javadoc
-    }
-
     task sourcesJar(type: Jar) {
-        classifier = 'sources'
         from sourceSets.main.allSource
+        classifier 'sources'
+    }
+
+    task javadocJar(type: Jar) {
+        from javadoc
+        classifier 'javadoc'
     }
 }