pipes-safe-2.2.4: changelog.md

# Version 2.2.4

* Increase upper bound on `pipes`

# Version 2.2.3

* Add several new instances to `SafeT`
* Add `tryP` and `catchP`

# Version 2.2.2

* Raise upper-bound on `exceptions` dependency

# Version 2.2.1

* Raise upper-bound on `exceptions` dependency.