644 commits since 0.9.0! with a lot of improvements and fixes.
Major changes:
- h2c/grpc are supported now, h2(encrypted) is not included.
- thrift support.
- Mac build support
- Extend ConcurrencyLimiter to control max-concurrency dynamically and an "auto" CL is supported by default
- CircuitBreaker support to isolate abnormal servers more effectively