Add backwards compatibility for 1.14

src/main/java/me/libraryaddict/disguise/utilities/reflection/NmsVersion.java

@@ -0,0 +1,9 @@
+package me.libraryaddict.disguise.utilities.reflection;
+
+/**
+ * Created by libraryaddict on 6/02/2020.
+ */
+public enum NmsVersion {
+    v1_14,
+    v1_15;
+}