Update test matrix

Author: antonpirker

tox.ini

@@ -47,7 +47,6 @@ envlist =
     {py2.7,py3.5,py3.6,py3.7}-falcon-1.4
     {py2.7,py3.5,py3.6,py3.7,py3.8,py3.9,py3.10}-falcon-2.0
     {py3.5,py3.6,py3.7,py3.8,py3.9}-falcon-{2.0,3.0}
-    {py3.5,py3.6,py3.7,py3.8,py3.9,py3.10}-falcon-{3.1}
 
     {py3.5,py3.6,py3.7}-sanic-{0.8,18}
     {py3.6,py3.7}-sanic-19
@@ -174,7 +173,6 @@ deps =
     falcon-1.4: falcon>=1.4,<1.5
     falcon-2.0: falcon>=2.0.0rc3,<3.0
     falcon-3.0: falcon>=3.0.0,<3.1.0
-    falcon-3.1: falcon>=3.1.0,<3.2.0
 
     sanic-0.8: sanic>=0.8,<0.9
     sanic-18: sanic>=18.0,<19.0