[LANG-1570] JavaVersion enum constants for Java 14 and 15. #553.
[LANG-1570] JavaVersion enum constants for Java 14 and 15. #553.

britter/commons-lang,MarkDacek/commons-lang,MarkDacek/commons-lang,britter/commons-lang,apache/commons-lang,MarkDacek/commons-lang,britter/commons-lang,apache/commons-lang,apache/commons-lang