- update to 1.14.0:
* Drop support for Python 3.8
* New `Repository.submodules` namespace
* New `Repository.listall_mergeheads()`,
`Repository.message`,
`Repository.raw_message` and `Repository.remove_message()`
* New `pygit2.enums` supersedes the `GIT_` constants
* Now `Repository.status()`, `Repository.status_file()`,
`Repository.merge_analysis()`, `DiffFile.flags`,
`DiffFile.mode`,
`DiffDelta.flags` and `DiffDelta.status` return enums
* Now repository\'s `merge()`, `merge_commits()` and
`merge_trees()` take enums/flags for their `favor`,
`flags` and `file_flags` arguments.
* Fix crash in filter cleanup
* Documentation fixes
* Remove deprecated `Repository.create_remote(...)` function,
use instead `Repository.remotes.create(...)`
* Deprecate `Repository.add_submodule(...)`, use
`Repository.submodules.add(...)`
* Deprecate `Repository.lookup_submodule(...)`, use
`Repository.submodules[...]`
* Deprecate `Repository.init_submodules(...)`, use
`Repository.submodules.init(...)`
* Deprecate `Repository.update_submodule(...)`, use
`Repository.submodules.update(...)`
* Deprecate `GIT_*` constants, use `pygit2.enums`
* Passign dicts to repository\'s `merge(...)`,
`merge_commits(...)` and `merge_trees(...)` is deprecated.
Instead pass `MergeFavor` for the `favor` argument, `MergeFlag`