Add minimum coverage (#1927)

Author: LeonLuttenberger

tox.ini

@@ -4,6 +4,8 @@ isolated_build = True
 
 [testenv]
 passenv = AWS_PROFILE AWS_DEFAULT_REGION AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN
+setenv =
+       COV_FAIL_UNDER = 88
 deps =
        .[sqlserver]
        .[oracle]
@@ -19,4 +21,5 @@ deps =
 commands =
        pytest -n {posargs} -s -v --timeout=300 --reruns=2 --reruns-delay=15 \
               --cov=awswrangler --cov-report=xml --cov-report term-missing --cov-branch \
+              --cov-fail-under={env:COV_FAIL_UNDER} \
               --junitxml=test-reports/junit.xml --log-file=test-reports/logs.txt tests