Update CHANGES
Do not reexport `property` from `Test.Hspec.QuickCheck`
Move requirement text from Item to SpecItem constructor
Move ProgressCallback out of Params
Update CHANGES
Bump version
Update CHANGES
Convert spec to internal tree structure before filtering
Minor refactoring
Add BuildSpecs constructor to SpecTree

This can be used to do IO when constructing the spec tree.
Rename package to hspec2, do not expose it
Add support for arguments to before/after/around
add beforeWith to transform param for cases