📚 docs(README): Restore old build badge.

Author: make-github-pseudonymous-again

README.md

@@ -39,7 +39,7 @@ let heaps = [
 
 [![License](https://img.shields.io/github/license/heap-data-structure/binomial-heap.svg)](https://raw.githubusercontent.com/heap-data-structure/binomial-heap/main/LICENSE)
 [![Version](https://img.shields.io/npm/v/@heap-data-structure/binomial-heap.svg)](https://www.npmjs.org/package/@heap-data-structure/binomial-heap)
-[![Tests](https://img.shields.io/github/workflow/status/heap-data-structure/binomial-heap/ci:test?event=push&label=tests)](https://github.com/heap-data-structure/binomial-heap/actions/workflows/ci:test.yml?query=branch:main)
+[![Build](https://img.shields.io/travis/heap-data-structure/binomial-heap/main.svg)](https://travis-ci.com/heap-data-structure/binomial-heap/branches)
 [![Dependencies](https://img.shields.io/david/heap-data-structure/binomial-heap.svg)](https://david-dm.org/heap-data-structure/binomial-heap)
 [![Dev dependencies](https://img.shields.io/david/dev/heap-data-structure/binomial-heap.svg)](https://david-dm.org/heap-data-structure/binomial-heap?type=dev)
 [![GitHub issues](https://img.shields.io/github/issues/heap-data-structure/binomial-heap.svg)](https://github.com/heap-data-structure/binomial-heap/issues)