Upgrade bintray plugin

Author: kaklakariada

build.gradle

@@ -1,13 +1,7 @@
-buildscript {
-	repositories {
-		jcenter()
-	}
-}
-
 plugins {
     id 'java'
     id 'maven-publish'
-    id 'com.jfrog.bintray' version '1.7.3'
+    id 'com.jfrog.bintray' version '1.8.0'
     id 'com.github.hierynomus.license' version '0.14.0'
 }