[Build] Fix bintray task

settings.gradle

@@ -1,7 +1,12 @@
+pluginManagement {
+    plugins {
+        id 'com.jfrog.bintray' version '1.8.5'
+    }
+}
+
 rootProject.name = 'imgui-java'
 include 'imgui-binding'
 include 'imgui-lwjgl3'
 include 'imgui-binding-natives'
 include 'imgui-app'
 include 'example'
-