build.gradle in embulk-output-gcs-0.3.0 vs build.gradle in embulk-output-gcs-0.4.0

@@ -1,9 +1,10 @@
 plugins {
     id "com.jfrog.bintray" version "1.1"
     id "com.github.jruby-gradle.base" version "0.1.5"
     id "java"
+    id "checkstyle"
     id "jacoco"
 }
 import com.github.jrubygradle.JRubyExec
 repositories {
     mavenCentral()
@@ -14,29 +15,46 @@
 }
 
 sourceCompatibility = 1.7
 targetCompatibility = 1.7
 
-version = "0.3.0"
+version = "0.4.0"
 
 dependencies {
-    compile  "org.embulk:embulk-core:0.7.3"
-    provided "org.embulk:embulk-core:0.7.3"
+    compile  "org.embulk:embulk-core:0.8.6"
+    provided "org.embulk:embulk-core:0.8.6"
 
     compile "com.google.http-client:google-http-client-jackson2:1.19.0"
     compile ("com.google.apis:google-api-services-storage:v1-rev28-1.19.1") {exclude module: "guava-jdk5"}
 
     testCompile "junit:junit:4.12"
-    testCompile "org.embulk:embulk-core:0.7.5:tests"
-    testCompile "org.embulk:embulk-standards:0.7.5"
+    testCompile "org.embulk:embulk-core:0.8.6:tests"
+    testCompile "org.embulk:embulk-standards:0.8.6"
 }
 
 task classpath(type: Copy, dependsOn: ["jar"]) {
     doFirst { file("classpath").deleteDir() }
     from (configurations.runtime - configurations.provided + files(jar.archivePath))
     into "classpath"
 }
 clean { delete 'classpath' }
+
+checkstyle {
+    configFile = file("${project.rootDir}/config/checkstyle/checkstyle.xml")
+    toolVersion = '6.14.1'
+}
+checkstyleMain {
+    configFile = file("${project.rootDir}/config/checkstyle/default.xml")
+    ignoreFailures = true
+}
+checkstyleTest {
+    configFile = file("${project.rootDir}/config/checkstyle/default.xml")
+    ignoreFailures = true
+}
+task checkstyle(type: Checkstyle) {
+    classpath = sourceSets.main.output + sourceSets.test.output
+    source = sourceSets.main.allJava + sourceSets.test.allJava
+}
 
 task gem(type: JRubyExec, dependsOn: ["build", "gemspec", "classpath"]) {
     jrubyArgs "-rrubygems/gem_runner", "-eGem::GemRunner.new.run(ARGV)", "build"
     script "build/gemspec"
     doLast { ant.move(file: "${project.name}-${project.version}.gem", todir: "pkg") }