Remove travis in favor of GitHub actions

Author: enocom

.travis.yml

@@ -1,4 +1,5 @@
-# Gopher Reading List [![Build Status](https://travis-ci.org/enocom/gopher-reading-list.svg?branch=master)](https://travis-ci.org/enocom/gopher-reading-list)
+# Gopher Reading List [![Build Status](https://github.com/enocom/gopher-reading-list/workflows/ci/badge.svg
+)](https://github.com/enocom/gopher-reading-list/actions?query=workflow%3ACI)
 
 Here is a reading list of blog posts about [Go](https://golang.org). It aspires
 to include only the most useful and relevant material that anyone writing Go