Document version scheme to avoid breaking users' applications

[ofek]

https://pagure.io/freeipa/issue/7082 https://github.com/etingof/pyasn1/issues/51 https://github.com/etingof/pyasn1/issues/52 https://github.com/etingof/pyasn1/issues/54

[etingof]

Thank you for raising this issue!

Just a quick note that I think we can rectify the first issue by adding backward-compatible interface to the SequenceOf type in the upcoming 0.3.2.

[etingof]

JFYI: https://github.com/etingof/pyasn1/pull/60 fixes the FreeIPA issue.

[tiran]

@etingof thanks for PR #60

[OJFord]

In semantic versioning, vX.y.z, y is a 'major' version in a sense where X is 0 - in the sense that breaking changes can be expected between v0.2.x and v0.3.x just as you would between v1.x.y and v2.x.y.