Add latest pytests to tox

Author: youtux

tox.ini

@@ -2,7 +2,7 @@
 distshare = {homedir}/.tox/distshare
 envlist = py38-pytestlatest-linters,
           py27-pytest{43,44,45,46}-coverage,
-          py38-pytest{43,44,45,46,50,51,52, latest}-coverage,
+          py38-pytest{43,44,45,46,50,51,52,53,54,60, latest}-coverage,
           py{35,36,38}-pytestlatest-coverage,
           py27-pytestlatest-xdist-coverage
 skip_missing_interpreters = true
@@ -13,6 +13,9 @@ setenv =
     xdist: _PYTEST_MORE_ARGS=-n3 -rfsxX
 deps =
     pytestlatest: pytest
+    pytest60: pytest~=6.0.0
+    pytest54: pytest~=5.4.0
+    pytest53: pytest~=5.3.0
     pytest52: pytest~=5.2.0
     pytest51: pytest~=5.1.0
     pytest50: pytest~=5.0.0