python3: bump gevent version

ligurio · ligurio · commit 6f8e6ac7829c · 2021-03-10T13:16:14.000+03:00
gevent 1.2 and below does not support Python 3.7 and above, see [1]. 1. gevent/gevent#1297 Part of #20
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 PyYAML==5.1
 argparse==1.1
 msgpack-python==0.4.6
-gevent==1.1b5
+gevent==21.1.2
 six>=1.8.0
