Angelos Evripiotis authored Nov 07, 2018 and Angelos Evripiotis committed Nov 08, 2018

Explain why it's useful to mention the decisions made for a change and
provide links for background, e.g. issue numbers.

My general experience of git histories is that folks don't do enough
explaining, so it's great we have a contributing section for it.

I've found it's easier for folks to stick to rules when they know the
practical reasons for them, so provide some.