ci: remove travis (#271)

* remove travis

* create workflow dir

Author: KazuCocoa

.github/unittest.yml .github/workflows/unittest.yml

@@ -11,8 +11,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu, macos]
         ruby: [2.2, 2.3, 2.4, 2.5, 2.6, 2.7]
+
     runs-on: ubuntu-latest
 
     steps:

.travis.yml

@@ -2,9 +2,7 @@
 
 [![Gem Version](https://badge.fury.io/rb/appium_lib_core.svg)](https://badge.fury.io/rb/appium_lib_core)
 
-| Travis, Ubuntu | Azure, Windows and functional tests |
-|:---:|:---:|
-|[![Build Status](https://travis-ci.org/appium/ruby_lib_core.svg?branch=master)](https://travis-ci.org/appium/ruby_lib_core)|[![Build Status](https://dev.azure.com/kazucocoa/ruby_lib_core/_apis/build/status/ruby_lib_core?branchName=master)](https://dev.azure.com/kazucocoa/ruby_lib_core/_build/latest?definitionId=9&branchName=master)|
+[![Build Status](https://dev.azure.com/kazucocoa/ruby_lib_core/_apis/build/status/ruby_lib_core?branchName=master)](https://dev.azure.com/kazucocoa/ruby_lib_core/_build/latest?definitionId=9&branchName=master)
 
 This library is a Ruby client for Appium.  The gem is available via [appium_lib_core](https://rubygems.org/gems/appium_lib_core).