Update README.md

README.md

@@ -1,6 +1,6 @@
 # CitizenLab
 
-![alt text](https://github.com/CitizenLabDotCo/citizenlab/blob/master/citizenlab_logo.jpg?raw=true)
+![CitizenLab](https://github.com/CitizenLabDotCo/citizenlab/blob/master/citizenlab_logo.png?raw=true)
 
 CitizenLab is a digital democracy platform that facilitates community participation and co-creation. Participants can post ideas, contribute to discussion, or choose to vote and prioritize community projects. Whether it’s through a poll, a participatory budget, or idea collection, the CitizenLab platform offers multiple ways to make your community participate.