Fix circleCI links in README (magma#2217)

Signed-off-by: mgermano <[email protected]>

Author: Michael Germano

README.md

@@ -1,6 +1,6 @@
 # Magma
 
-[![facebookincubator](https://circleci.com/gh/facebookincubator/magma.svg?style=shield)](https://circleci.com/gh/facebookincubator/magma)
+[![magma](https://circleci.com/gh/magma/magma.svg?style=shield)](https://circleci.com/gh/magma/magma)
 
 Magma is an open-source software platform that gives network operators an open, flexible and extendable mobile core network solution. Magma enables better connectivity by: