build: use github actions instead travis/appveyor

.github/workflows/ci.yml

@@ -59,15 +59,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
 
-      - name: Setup p7zip Ubuntu
-        if: matrix.operating-system == 'ubuntu-latest'
-        run: |
-          sudo apt-get purge p7zip-rar p7zip-full
-          curl -L https://github.com/jinfeihan57/p7zip/archive/v17.03.tar.gz > v17.03.tar.gz
-          tar xzvf v17.03.tar.gz
-          cd p7zip-17.03
-          make all3
-          sudo ./install.sh
+      #- name: Setup p7zip Ubuntu. already installed
       - name: Setup p7zip MacOs
         if: matrix.operating-system == 'macos-latest'
         run: |

README.md

@@ -2,8 +2,7 @@
 
 [![License](https://poser.pugx.org/gemorroj/archive7z/license)](https://packagist.org/packages/gemorroj/archive7z)
 [![Latest Stable Version](https://poser.pugx.org/gemorroj/archive7z/v/stable)](https://packagist.org/packages/gemorroj/archive7z)
-[![Build Status Travis](https://secure.travis-ci.org/Gemorroj/Archive7z.png?branch=master)](https://travis-ci.org/Gemorroj/Archive7z)
-[![Build Status AppVeyor](https://ci.appveyor.com/api/projects/status/3i7po8fka1eqdb8a?svg=true)](https://ci.appveyor.com/project/Gemorroj/archive7z)
+[![Continuous Integration](https://github.com/Gemorroj/Archive7z/workflows/Continuous%20Integration/badge.svg?branch=master)](https://github.com/Gemorroj/Archive7z/actions?query=workflow%3A%22Continuous+Integration%22)
 
 
 ### Features: