Current stable version for use with the reproduce tool.

Add 2.4.0 changelog entry. (google#2173)

Move timeout subtraction outside Engine.fuzz. (google#2108)

Currently it's not obvious at all to users of Engine.fuzz how long
fuzzing will go for when a max_time is passed.

Add Engine.fuzz_additional_processing_timeout so that the caller can
explicitly subtract the necessary processing time themselves if needed.

Remove engine_common.POSTPROCESSING_TIME. This was a holdout from the
launcher days. This is moved to the AFL launcher and can be removed
there as well once that's migrated to the Engine interface.

Remove past.builtins. (google#2075)

Update changelog for version 2.2.0. (google#2073)

Update CHANGELOG for release (google#1953)

Add changelog entry for version 2.0.2. (google#1873)

* Add changelog entry for version 2.0.2.

* Address review comments.

Update CHANGELOG.md

Add crash address parsing for GDB. (google#1770)

Update CHANGELOG.md (google#1713)