Revert code breaking change when using Kotlin and NBTList

Author: jglrxavpok

build.gradle

@@ -10,7 +10,7 @@ java {
 }
 
 group 'org.jglrxavpok.nbt'
-version '1.1.6'
+version '1.1.7'
 
 repositories {
     mavenCentral()

src/main/kotlin/org/jglrxavpok/hephaistos/nbt/NBTList.kt

@@ -68,10 +68,6 @@ class NBTList<Tag: NBT>(val subtagType: Int): Iterable<Tag>, NBT {
         add(tag)
     }
 
-    operator fun plusAssign(tags: Iterable<Tag>) {
-        add(tags)
-    }
-
     /**
      * Appends a tag of the end of this list
      */
@@ -81,11 +77,6 @@ class NBTList<Tag: NBT>(val subtagType: Int): Iterable<Tag>, NBT {
         tags += tag
     }
 
-    /**
-     * Appends a list of tags to the end of this list
-     */
-    fun add(tags: Iterable<Tag>): Unit = tags.forEach(::add)
-
     /**
      * Casts this list to another list type. Can throw a ClassCastException, so be careful
      */
@@ -130,9 +121,9 @@ class NBTList<Tag: NBT>(val subtagType: Int): Iterable<Tag>, NBT {
     }
 
     override fun deepClone() = NBTList<Tag>(subtagType).let {
-        it += tags.map { element ->
+        tags.map { element ->
             element.deepClone() as Tag
-        }
+        }.forEach(it::add)
         it
     }
 }