[PRs] How to update on Github

[ZombineDev via Digitalmars-d]

Basically you need clone your fork to your computer, add a 
"upstream" remote to github.com/D-Programming-Language/[repo 
name, eg. phobos], pull from upstream the new changes and 
optionally update github by pushing to origin (origin normally is 
github).
It may sound complicated doing this from the command-line, but 
after a few times you'll get used to it.