Remove bintray-publish library and update Gradle plugin version.

build.gradle

@@ -23,7 +23,6 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.2'
-        classpath 'com.novoda:bintray-release:0.9.1'
+        classpath 'com.android.tools.build:gradle:4.1.2'
     }
 }

graphenej/build.gradle

@@ -1,16 +1,5 @@
-apply plugin: 'com.novoda.bintray-release'
 apply plugin: 'com.android.library'
 
-publish {
-    userOrg = 'bilthon'
-    groupId = 'cy.agorise.graphenej'
-    artifactId = 'graphenej'
-    publishVersion = '0.6.0'
-    repoName = 'Graphenej'
-    desc = 'A Java library for mobile app Developers; Graphene/Bitshares blockchain.'
-    website = 'https://github.com/Agorise/graphenej'
-}
-
 android {
     compileSdkVersion 28