to pmq20#128 - switch to the oldest runners available on Github Action

.github/workflows/linux.yml

@@ -8,7 +8,7 @@ jobs:
   make:
     strategy:
       matrix:
-        os: [ubuntu-20.04]
+        os: [ubuntu-16.04]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/windows.yml

@@ -9,8 +9,8 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: windows-2019
-            vs: 2019
+          - os: windows-2016
+            vs: 2017
       fail-fast: false
     runs-on: ${{ matrix.os }}
     env:

.travis.yml

@@ -0,0 +1,22 @@
+language: ruby
+
+rvm: 2.7.1
+
+os: osx
+
+osx_image: xcode7.3	
+
+addons:
+  apt:
+    packages:
+      - squashfs-tools
+
+before_install:
+  - brew update
+  - brew install squashfs
+
+before_script:
+  - mksquashfs -version
+
+script:
+  - rake test

README.md

@@ -5,7 +5,7 @@ https://enclose.io/rubyc
 *Packing your Ruby application into a single executable.*
 
 [![Windows](https://github.com/pmq20/ruby-packer/workflows/Windows/badge.svg)](https://github.com/pmq20/ruby-packer/actions?query=workflow%3A"Windows")
-[![macOS](https://github.com/pmq20/ruby-packer/workflows/macOS/badge.svg)](https://github.com/pmq20/ruby-packer/actions?query=workflow%3A"macOS")
+[![macOS](https://travis-ci.org/pmq20/ruby-packer.svg?branch=master)](https://travis-ci.org/pmq20/ruby-packer)
 [![Linux](https://github.com/pmq20/ruby-packer/workflows/Linux/badge.svg)](https://github.com/pmq20/ruby-packer/actions?query=workflow%3A"Linux")
 
 ## Features