Merge pull request #2012 from filecoin-project/schomatis/feat/doc/REA…

…DME/branches

doc: active development branches

README.md

@@ -4,13 +4,18 @@
 
 Lotus is an implementation of the Filecoin Distributed Storage Network. For more details about Filecoin, check out the [Filecoin Spec](https://github.com/filecoin-project/specs).
 
+## Building & Documentation
+
+For instructions on how to build lotus from source, please visit [https://docs.lotu.sh](https://docs.lotu.sh) or read the source [here](https://github.com/filecoin-project/lotus/tree/master/documentation).
+
 ## Development
 
 All work is tracked via issues. An attempt at keeping an up-to-date view on remaining work is in the [lotus testnet github project board](https://github.com/filecoin-project/lotus/projects/1).
 
-## Building & Documentation
-
-For instructions on how to build lotus from source, please visit [https://docs.lotu.sh](https://docs.lotu.sh) or read the source [here](https://github.com/filecoin-project/lotus/tree/master/documentation).
+The main branches under development at the moment are:
+* [`master`](https://github.com/filecoin-project/lotus): current testnet.
+* [`next`](https://github.com/filecoin-project/lotus/tree/next): working branch with chain-breaking changes.
+* [`interopnet`](https://github.com/filecoin-project/lotus/tree/interopnet): devnet running one of `next` commits.
 
 ## License