Optimization: Make consensus-based read ops more efficient
On read operations, once we've achieved quorum and read the value that we need, cancel pending in-flight futures.
What's Changed
- Improve examples in doctests and README by @brainix in #460
- In NextId getter, bail out when quorum achieved by @brainix in #461
- Make consensus-based read ops more efficient by @brainix in #462
Full Changelog: v1.4.0...v1.4.1