更新jitpack打包脚本，解决pom文件里面无引用依赖的问题

Author: licheedev

build.gradle

@@ -7,8 +7,8 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.3'
-        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'
+        classpath 'com.android.tools.build:gradle:3.2.0'
+        classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

jitpack.gradle

@@ -1,6 +1,7 @@
 apply plugin: 'com.github.dcendents.android-maven'
 
 group = 'com.github.licheedev'
+version = '1.0'
 
 tasks.withType(JavaCompile) {
     options.encoding = "UTF-8"