Replace Travis with Github Actions

.travis.yml

@@ -1,17 +0,0 @@
-language: bash
-script: 
-  - asdf plugin test golang $TRAVIS_BUILD_DIR --asdf-plugin-gitref $TRAVIS_COMMIT go version
-before_script:
-  - if [ $TRAVIS_OS_NAME = linux ]; then sudo apt-get install -y bsdmainutils; fi
-  - git clone https://github.com/asdf-vm/asdf.git
-  - . asdf/asdf.sh
-matrix:
-  include:
-   - os: linux
-     arch: amd64
-   - os: linux
-     arch: ppc64le
-   - os: linux
-     arch: arm64
-   - os: osx
-     arch: amd64

README.md

@@ -1,6 +1,6 @@
 # asdf-golang
 
-[![Build Status](https://app.travis-ci.com/kennyp/asdf-golang.svg?branch=master)](https://app.travis-ci.com/kennyp/asdf-golang)
+[![CI](https://github.com/kennyp/asdf-golang/actions/workflows/main.yml/badge.svg)](https://github.com/kennyp/asdf-golang/actions/workflows/main.yml)
 
 golang plugin for [asdf version manager](https://github.com/asdf-vm/asdf)