Older gevent version is not compatible with greenlet

Author: t-persson

requirements.txt

@@ -24,4 +24,5 @@ Flask==1.1.1
 Flask-GraphQL==2.0.0
 graphene==2.1.8
 gunicorn==20.0.4
+greenlet==0.4.14
 gevent==1.4.0

setup.cfg

@@ -23,7 +23,7 @@ package_dir =
     =src
 # DON'T CHANGE THE FOLLOWING LINE! IT WILL BE UPDATED BY PYSCAFFOLD!
 setup_requires = pyscaffold>=3.2a0,<3.3a0
-install_requires = eiffellib==1.2.0;requests==2.22.0;pymongo[srv]==3.12.0;graphql-core==2.2.1;gql==0.1.0;Flask==1.1.1;Flask-GraphQL==2.0.0;graphene==2.1.8;gunicorn==20.0.4;gevent==1.4.0
+install_requires = eiffellib==1.2.0;requests==2.22.0;pymongo[srv]==3.12.0;graphql-core==2.2.1;gql==0.1.0;Flask==1.1.1;Flask-GraphQL==2.0.0;graphene==2.1.8;gunicorn==20.0.4;greenlet==0.4.14;gevent==1.4.0
 
 [options.package_data]
 * = *.json