sort of working Minestom implementation

platforms/sponge/build.gradle.kts

@@ -1,5 +1,3 @@
-import com.dfsek.terra.configureCommon
-
 plugins {
     java
     id("org.spongepowered.plugin").version("0.9.0")
@@ -14,6 +12,11 @@ repositories {
     jcenter()
 }
 
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_1_8
+}
+
 dependencies {
     "compileOnly"("org.spongepowered:spongeapi:7.2.0")
     "shadedApi"(project(":common"))