hopefully build using jdk8

Author: sanity

build.gradle

@@ -1,5 +1,5 @@
 group 'com.github.sanity'
-version '0.0.3'
+version '0.0.4'
 
 buildscript {
     ext.kotlin_version = '1.1-M04'
@@ -28,6 +28,7 @@ apply plugin: 'org.jetbrains.dokka'
 apply plugin: "info.solidsoft.pitest"
 
 sourceCompatibility = 1.8
+targetCompatibility = 1.8
 
 repositories {
     mavenCentral()