Update readme.

[riga]

This PR is meant to trigger contributors to be added to the readme (more than 5 or very recent commits / PRs)

[riga]

@all-contributors please add @riga for code, review, maintenance and docs

[allcontributors[bot]]

@riga

I've put up a pull request to add @riga! :tada:

[riga]

@all-contributors please add @pfackeldey for code

[allcontributors[bot]]

@riga

I've put up a pull request to add @pfackeldey! :tada:

[riga]

@all-contributors please add @yrath for code

[allcontributors[bot]]

@riga

I've put up a pull request to add @yrath! :tada:

[riga]

@all-contributors please add @jaimeleonh for code

[allcontributors[bot]]

@riga

I've put up a pull request to add @jaimeleonh! :tada:

[riga]

@all-contributors please add @lmoureaux for code

[allcontributors[bot]]

@riga

I've put up a pull request to add @lmoureaux! :tada:

[riga]

@all-contributors please add @lgeiger for code

[allcontributors[bot]]

@riga

I've put up a pull request to add @lgeiger! :tada: