Drop Travis-CI

We are having problems with instantiating Node.js 18 and 20.
We have enough coverage as it is.

README.md

@@ -1,7 +1,6 @@
 # audit-ci
 
 [![npm version](https://badge.fury.io/js/audit-ci.svg)](https://badge.fury.io/js/audit-ci)
-[![Build Status](https://app.travis-ci.com/IBM/audit-ci.svg?branch=main)](https://app.travis-ci.com/github/IBM/audit-ci)
 [![CircleCI](https://circleci.com/gh/IBM/audit-ci/tree/main.svg?style=svg)](https://circleci.com/gh/IBM/audit-ci/tree/main)
 [![GitHub CI](https://github.com/IBM/audit-ci/actions/workflows/build.yml/badge.svg)](https://github.com/IBM/audit-ci/actions/workflows/build.yml)
 [![CodeQL](https://github.com/IBM/audit-ci/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/IBM/audit-ci/actions/workflows/codeql-analysis.yml)

types/JSONStream/index.d.ts

@@ -3,7 +3,6 @@
 // This vendor definition is inlined directly in the project
 // to avoid capitalization issues caused on Linux machines.
 // See failed builds:
-// https://app.travis-ci.com/github/IBM/audit-ci/builds/260124479
 // https://app.circleci.com/jobs/github/quinnturner/audit-ci/367
 
 // Type definitions for JSONStream v0.8.0