Add Extinction Rebellion (#206)

Extinction Rebellion is a decentralised, international and politically non-partisan movement using non-violent direct action and civil disobedience to persuade governments to act justly on the Climate and Ecological Emergency.

README.md

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 - [ClimateAction.Tech](https://climateaction.tech/) - A global community of tech professionals using our skills, expertise and platforms to support solutions to the climate crisis. The mission is to empower technology professionals to play our part — to meet, discuss, learn and take climate action.
 - [ClimatePrediction.net](https://www.climateprediction.net/) - The world’s largest climate modelling experiment. Evidence of how our climate is changing is vital to reducing greenhouse gas emissions.  Help discover how the climate could look by running software on your computer.
 - [Economists for Future](https://econ4future.org/) - Economists for Future growing movement of people committed to galvanising the economics community behind addressing the greatest challenge of our day. If the discipline which dedicates itself to studying the economy cannot sufficiently engage in the economic transformation that the climate science requires, then who else can be expected to do this?
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+- [Extinction Rebellion](https://rebellion.global/) - Extinction Rebellion is a decentralised, international and politically non-partisan movement using non-violent direct action and civil disobedience to persuade governments to act justly on the Climate and Ecological Emergency.
 - [Eyes of the Reef Hawai'i](https://eorhawaii.org/2013/07/18/become-a-member/) - Network to inform, engage and train people to identify coral bleaching, disease and invasive species outbreaks. They have a broad outreach program that helps to provide critical training for rapid response monitoring and stewardship of precious marine resources.
 - [Greenpeace](https://engage.us.greenpeace.org/onlineactions/Hx3BaZLxxkyUUo2Jfzsk7w2) - Greenpeace has many ways for people to get involved. Start small by launching and participating in campaigns and petitions, or go further and discover or create events. Play an active role in achieving a green and peaceful future!
 - [Habitat for Humanity](http://www.habitat.org/getinv) - Habitat for Humanity is well known for building simple, affordable homes for people in need. But recently the organization has implemented new programs recognizing climate change as a major threat to the environment and which can destroy the homes they build.