Remove all references to travis

We no longer use travis for releasing.

Author: Windvis

.npmignore

@@ -5,5 +5,4 @@
 /.eslintrc.js
 /.github_changelog_generator
 /.github/
-/.travis.yml
 /yarn.lock

.travis.yml

@@ -4,7 +4,6 @@ ember-cli-blueprint-test-helpers
 
 [![npm version](https://badge.fury.io/js/ember-cli-blueprint-test-helpers.svg)](https://badge.fury.io/js/ember-cli-blueprint-test-helpers)
 [![GitHub Actions CI][github-actions-badge]][github-actions-ci-url]
-[![Build Status](https://travis-ci.org/ember-cli/ember-cli-blueprint-test-helpers.svg?branch=master)](https://travis-ci.org/ember-cli/ember-cli-blueprint-test-helpers)
 
 test helpers for [ember-cli](https://github.com/ember-cli/ember-cli) blueprints