Bump cython from 0.29.6 to 0.29.7

[dependabot-preview[bot]]

Bumps cython from 0.29.6 to 0.29.7.

Changelog

*Sourced from [cython's changelog](https://github.com/cython/cython/blob/master/CHANGES.rst).* > 0.29.7 (2019-04-14) > =================== > > Bugs fixed > ---------- > > - Crash when the shared Cython config module gets unloaded and another Cython module reports an exceptions. Cython now makes sure it keeps an owned reference to the module. (Github issue [\#2885](https://github.com/cython/cython/issues/\2885)) > - Resolved a C89 compilation problem when enabling the fast-gil sharing feature. > - Coverage reporting did not include the signature line of `cdef` functions. (Github issue [\#1461](https://github.com/cython/cython/issues/\1461)) > - Casting a GIL-requiring function into a nogil function now issues a warning. (Github issue [\#2879](https://github.com/cython/cython/issues/\2879)) > - Generators and coroutines were missing their return type annotation. (Github issue [\#2884](https://github.com/cython/cython/issues/\2884))

Commits

- [`3b3bcbf`](https://github.com/cython/cython/commit/3b3bcbfc3f28259e75e363b3d872e82b35d47f19) Prepare release of 0.29.7. - [`2068587`](https://github.com/cython/cython/commit/2068587759a86135e428811b4746eb5cb0d5fa4e) Work around Py2 unicode print issue in tests. - [`c67d508`](https://github.com/cython/cython/commit/c67d5089650009acebf81ea6ab0daeefc91e58a4) Fix C89 "declarations after code" issue. - [`d55bb94`](https://github.com/cython/cython/commit/d55bb94a5069120afac499903db349654ba6d29b) Remove unused fields in ControlBlock class (were used before switching to bit... - [`e04fc8e`](https://github.com/cython/cython/commit/e04fc8ea3b55daba02c7ec92d9d813699ab01167) At module cleanup time, clear the module dict before the global references th... - [`566fc5c`](https://github.com/cython/cython/commit/566fc5c0f8da48b3bc6d1277173b7c958e589a45) Keep owned references to builtins module, "cython_runtime" module and preimpo... - [`7941b93`](https://github.com/cython/cython/commit/7941b93adee1b8f3be102cbbafac392a051fc904) Add missing return type annotation to generators and coroutines. - [`61505ce`](https://github.com/cython/cython/commit/61505ce492a8060f3458954320a5533d22a87c03) Issue a warning when casting a GIL-requiring function into a nogil function (... - [`e8a9ab9`](https://github.com/cython/cython/commit/e8a9ab94f2334eb57550d0f29a337d230ae1ba88) Fix nogil status for error handling in line tracing code of with/try-finally ... - [`d634196`](https://github.com/cython/cython/commit/d6341966d991e9077446258e4c727341098ed84a) Refactor parsing function in code coverage plugin to split the actual parsing... - Additional commits viewable in [compare view](https://github.com/cython/cython/compare/0.29.6...0.29.7)

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[dependabot-preview[bot]]

Looks like cython is up-to-date now, so this is no longer needed.