Update build config

Author: YiiGuxing

build.gradle

@@ -1,30 +1,22 @@
 
 
 buildscript {
-    ext.kotlinVersion = kotlinVersion
     repositories {
-        maven { url = 'http://maven.aliyun.com/nexus/content/groups/public/' }
         jcenter()
         mavenCentral()
     }
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
-    }
 }
 
 plugins {
-    id 'org.jetbrains.intellij' version '0.3.4'
+    id "org.jetbrains.intellij" version "0.4.2"
+    id 'org.jetbrains.kotlin.jvm' version '1.3.21'
 }
 
 repositories {
-    maven { url = 'http://maven.aliyun.com/nexus/content/groups/public/' }
     jcenter()
     mavenCentral()
 }
 
-apply plugin: 'kotlin'
-apply plugin: 'org.jetbrains.intellij'
-
 group = 'cn.yiiguxing.plugin.md.palette'
 version = "${version}${buildNumber ? '-' + buildNumber : ''}"
 

gradle.properties

@@ -2,12 +2,10 @@
 version=1.1
 buildNumber=
 ideaVersion=2017.1
-kotlinVersion=1.2.50
 javaVersion=1.8
 javaTargetVersion=1.8
 kotlinLanguageVersion=1.2
 kotlinTargetVersion=1.1
 sources=true
 customSinceBuild=171
-customUntilBuild=
-org.gradle.jvmargs='-Dfile.encoding=UTF-8'
+customUntilBuild=