force greenlet version 0.4.16 because of ABI incompatibility...

abom · abom · commit c222acf864fe · 2020-09-23T12:20:52.000+02:00
to be updated after fixing similar issues python-greenlet/greenlet#178
diff --git a/pyproject.toml b/pyproject.toml
@@ -10,6 +10,7 @@ license = "Apache-2.0"
 [tool.poetry.dependencies]
 cryptography = "3.0"
 js-ng = "11.0b3"
+greenlet = "0.4.16"
 python = "^3.6"
 pillow = "^6.1"
 sendgrid = "^6.0"
