fail 0.5.1

Fail points for rust.
Documentation
# 0.5.1 - 2022-10-08

- Switch to 2021 edition and use once cell (#61)
- Support configuring fail point in RAII style (#62)
- Fix recursive macro invocation (#66)

# 0.5.0 - 2021-11-04

- update rand to 0.8

# 0.4.0 - 2020-04-13

- re-arrange macros to avoid leaking
- support callback action
- update rand to 0.7

# 0.3.0 - 2019-07-15

- fail-rs is now 2018-edition compatible!
- refine documentations
- add test-mutex pattern directly to the library
- disable code generation by default

# 0.2.1 - 2018-12-13

- improve documentation

# 0.2.0 - 2017-12-21

- use name to identify failpoint instead of absolute module path
- support listing configured rules

# 0.1.0 - 2017-09-27

initial release