fail 0.4.0

Fail points for rust.
Documentation
# 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