upgrade: simple-ypk-packer 0.5.0

build.gradle

@@ -2,8 +2,6 @@ plugins {
     id 'java'
     id 'idea'
 }
-def currVersion = "1.1.0"
-ext.projectIds = ['group': 'org.bdware.sc.contractexample', 'version': currVersion]
 
 tasks.withType(JavaCompile) {
     options.compilerArgs << '-Xlint:none'
@@ -15,8 +13,8 @@ repositories {
 }
 project(':backend') {
     group = "org.bdware.sc.example"
-    version = projectIds.version
     repositories {
+        mavenCentral()
         maven { url 'https://maven.aliyun.com/repository/public' }
     }
 }