OTPC #10 Policy on API compatibility in minor releases

[Tomas Mraz]

This proposal adds policy on API changes allowed in minor releases.

https://github.com/openssl/technical-policies/pull/10

TL;DR: No changes except additions are allowed in minor releases.
-- 
Tomáš Mráz
No matter how far down the wrong road you've gone, turn back.
                                              Turkish proverb
[You'll know whether the road is wrong if you carefully listen to your
conscience.]