Bugfixes
--------
Update to greenlet 2.0. This fixes a deallocation issue that required a change
in greenlet's ABI. The design of greenlet 2.0 is intended to prevent future
fixes and enhancements from requiring an ABI change, making it easier to
update gevent and greenlet independently.
greenlet 2.0 requires a modern-ish C++ compiler.
This may mean certain older platforms are no longer supported. See :issue:`1909`.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
