Use the develop branch

Basho uses the develop branch (not master) and that one is most up-to-date

index/bitcask.mk

@@ -4,4 +4,4 @@ pkg_bitcask_description = because you need another a key/value storage engine
 pkg_bitcask_homepage = https://github.com/basho/bitcask
 pkg_bitcask_fetch = git
 pkg_bitcask_repo = https://github.com/basho/bitcask
-pkg_bitcask_commit = master
+pkg_bitcask_commit = develop