feat: upgrade to native 1.4.+

android/build.gradle

@@ -1,43 +1,55 @@
 group 'io.agora.agora_rtm'
 
+def safeExtGet(prop, fallback) {
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+}
+
 buildscript {
+    def kotlin_version = rootProject.ext.has('kotlin_version') ? rootProject.ext.get('kotlin_version') : '1.3.72'
+
     repositories {
+        mavenCentral()
         google()
-        jcenter()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 
 rootProject.allprojects {
     repositories {
+        mavenCentral()
         google()
-        jcenter()
+        maven { url 'https://www.jitpack.io' }
     }
 }
 
 apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion safeExtGet('compileSdkVersion', 28)
+    buildToolsVersion safeExtGet('buildToolsVersion', '28.0.3')
+
+    defaultConfig {
+        minSdkVersion safeExtGet('minSdkVersion', 16)
+        targetSdkVersion safeExtGet('targetSdkVersion', 28)
+
+        consumerProguardFiles 'consumer-rules.pro'
+    }
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
     }
-    defaultConfig {
-        minSdkVersion 16
-        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
-    }
+
     lintOptions {
         disable 'InvalidPackage'
     }
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'io.agora.rtm:rtm-sdk:1.2.2'
+    api 'com.github.agorabuilder:rtm-sdk:1.4.7'
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:${safeExtGet('kotlin_version', '1.3.72')}"
 }

android/consumer-rules.pro

@@ -0,0 +1,5 @@
+-keepattributes *Annotation*
+-keep class kotlin.** { *; }
+-keep class org.jetbrains.** { *; }
+
+-keep class io.agora.**{*;}