Fixing build

Author: sinwe

build.gradle

@@ -2,6 +2,8 @@ buildscript {
     ext {
         springBootVersion = '2.0.2.RELEASE'
         bintrayPluginVersion = '1.7.3'
+        bintrayUsername = bintrayUser
+        bintrayKey = bintrayApiKey
     }
     repositories {
         mavenCentral()
@@ -44,13 +46,10 @@ jar {
     version = "${project.version}"
 }
 
-ext.bintrayUsername = bintrayUser
-ext.bintrayKey = bintrayApiKey
-
 bintray {
     user = "$bintrayUsername"
     key = "$bintrayKey"
-    publication = ['MyPublication']
+    publications = ['MyPublication']
     configurations = ['archives']
     pkg {
         repo = 'sinwe-maven'
@@ -63,7 +62,7 @@ bintray {
 }
 
 publishing {
-    publication {
+    publications {
         MyPublication(MavenPublication) {
             from components.java
             groupId "${project.group}"