bump test coverage threshold to 86

Author: laurenyu

tox.ini

@@ -63,7 +63,7 @@ passenv =
 # Can be used to specify which tests to run, e.g.: tox -- -s
 commands =
     coverage run --source sagemaker -m pytest {posargs}
-    {env:IGNORE_COVERAGE:} coverage report --fail-under=85 --omit */tensorflow/tensorflow_serving/*
+    {env:IGNORE_COVERAGE:} coverage report --fail-under=86 --omit */tensorflow/tensorflow_serving/*
 extras = test
 
 [testenv:flake8]