Explicit Java version

Author: RobFaustLZ

build.gradle

@@ -7,6 +7,11 @@ plugins {
 group = 'com.labelzoom.api'
 version = '1.0.12'
 
+java {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+}
+
 repositories {
     mavenCentral()
 }