Migrate to travis-ci.com

Replace travis-ci.org with travis-ci.com domain in README.

README.md

@@ -2,7 +2,7 @@
 
 [![License](https://img.shields.io/github/license/gonvenience/text.svg)](https://github.com/gonvenience/text/blob/main/LICENSE)
 [![Go Report Card](https://goreportcard.com/badge/github.com/gonvenience/text)](https://goreportcard.com/report/github.com/gonvenience/text)
-[![Build Status](https://travis-ci.org/gonvenience/text.svg?branch=main)](https://travis-ci.org/gonvenience/text)
+[![Build Status](https://travis-ci.com/gonvenience/text.svg?branch=main)](https://travis-ci.com/gonvenience/text)
 [![Codecov](https://img.shields.io/codecov/c/github/gonvenience/text/main.svg)](https://codecov.io/gh/gonvenience/text)
 [![PkgGoDev](https://pkg.go.dev/badge/github.com/gonvenience/text)](https://pkg.go.dev/github.com/gonvenience/text)
 [![Release](https://img.shields.io/github/release/gonvenience/text.svg)](https://github.com/gonvenience/text/releases/latest)