Fix chumak version

1.1.1 didn't exist, so I put master for now.

index/chumak.mk

@@ -4,4 +4,4 @@ pkg_chumak_description = Pure Erlang implementation of ZeroMQ Message Transport
 pkg_chumak_homepage = http://choven.ca
 pkg_chumak_fetch = git
 pkg_chumak_repo = https://github.com/chovencorp/chumak
-pkg_chumak_commit = 1.1.1
+pkg_chumak_commit = master