Update README.md
Lets have a look at some numbers
We don't need this anymore

/cc @patcon @ipwnstuff
Merge branch 'master' into feature/update-readme

Conflicts:
	README.md
Merge pull request #18 from ipwnstuff/feature/update-readme

Add information about releases and contributing
Use h2 instead of h1 for the Changelog section
Added @anselmh's CONTRIBUTING.md file.
Fixed link.
Clarified use of `hub pull-request`.
Merge pull request #28 from myplanet-experimental/28-contributing-md

Add CONTRIBUTING.md
Merge branch 'master' into feature/yaml-format

Conflicts:
	README.md