This recommended update contains the current stable version of tor 0.4.7.7. It contains overall network speed improvement, security improvements and bug fixes: 

* New feature: Congestion control to improve traffic speed and stability on the network
* Improved mitigation against guard discovery attacks on clients and short-lived services
* Improve observed performance under DNS load
* Improve handling of overload state
* end-of-life relays running versions 0.3.5.x, 0.4.2.x, 0.4.3.x, 0.4.4.x and 0.4.5 alphas/rc are now rejected
* Onion service v2 addresses are no longer recognized