rendezvous

This release includes the change to allow end users to configure the size of hopper index files, fixes the bug where the sinks gets stuck in the valve closed state, and also explicitly updates Cargo.toml to point to hopper 0.3.2, which was already on stable branch in the Cargo.lock file, but wasn't present in the config.

• 7cae683 :: avoid getting stuck on a closed sink valve
• 2918f08 :: allow hopper maximum index size to be configured