Prepare 0.3.1 release

Author: alessfg

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## 0.3.1 (Unreleased)
+## 0.3.1 (December 22, 2020)
 
 ENHANCEMENTS:
 

README.md

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 [![Ansible Galaxy](https://img.shields.io/badge/galaxy-nginxinc.nginx__config-5bbdbf.svg)](https://galaxy.ansible.com/nginxinc/nginx_config)
-[![Build Status](https://travis-ci.org/nginxinc/ansible-role-nginx-config.svg?branch=main)](https://travis-ci.org/nginxinc/ansible-role-nginx-config)
+[![Molecule CI/CD](https://github.com/nginxinc/ansible-role-nginx-config/workflows/Molecule%20CI/CD/badge.svg)](https://github.com/nginxinc/ansible-role-nginx-config/actions)
 [![License](https://img.shields.io/badge/License-Apache--2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
 # 👾 *Help make the NGINX config Ansible role better by participating in our [survey](https://forms.office.com/Pages/ResponsePage.aspx?id=L_093Ttq0UCb4L-DJ9gcUKLQ7uTJaE1PitM_37KR881UM0NCWkY5UlE5MUYyWU1aTUcxV0NRUllJSC4u)!* 👾