Changelog:
==========
-Removed support for EOL Python 2.7, 3.6, 3.7
-Added support for previously missing RELATIVE-OID construct
-Updated link to Layman's Guide
(From OE-Core rev: 2c6615686019d886edf8f0e8c731a67f166de5d1)
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
