Bump up coverage percentage cut at tox

Author: etingof

tox.ini

@@ -1,6 +1,8 @@
 [tox]
 minversion = 3.4.0
-envlist = {py27, py35, py36, py37, py38}-{unittest}, conver, bandit, build
+envlist =
+    {py27, py35, py36, py37, py38}-{unittest},
+    cover, docs, bandit, build
 isolated_build = true
 skip_missing_interpreters = true
 
@@ -52,7 +54,7 @@ deps =
     discover
 commands = coverage erase
            coverage run --source pyasn1_modules -m unittest discover {posargs}
-           coverage report --fail-under 80
+           coverage report --fail-under 93
 
 [testenv:bandit]
 skip_install = true