updating build badge to github actions CI badge in README.md (#249)

* fix exception handling in get_action_for_service

* update readme

README.md

@@ -2,7 +2,7 @@
 
 IAM Least Privilege Policy Generator.
 
-[![Build Status](https://travis-ci.org/salesforce/policy_sentry.svg?branch=master)](https://travis-ci.org/salesforce/policy_sentry)
+[![continuous-integration](https://github.com/salesforce/policy_sentry/workflows/continuous-integration/badge.svg?)](https://github.com/salesforce/policy_sentry/actions?query=workflow%3Acontinuous-integration)
 [![Documentation Status](https://readthedocs.org/projects/policy-sentry/badge/?version=latest)](https://policy-sentry.readthedocs.io/en/latest/?badge=latest)
 [![Join the chat at https://gitter.im/salesforce/policy_sentry](https://badges.gitter.im/salesforce/policy_sentry.svg)](https://gitter.im/salesforce/policy_sentry?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Downloads](https://pepy.tech/badge/policy-sentry)](https://pepy.tech/project/policy-sentry)