add CI in Github Actions, remove Travis CI

.github/workflows/ci.yml

@@ -0,0 +1,51 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu2004:
+    name: "Ubuntu 20.04"
+    runs-on: ubuntu-20.04
+    if: "!contains(github.event.head_commit.message, '[skip ci]')"
+    steps:
+    - uses: actions/checkout@v2
+    - name: dependencies
+      run: |
+        sudo apt-get install g++ libz-dev libboost-dev libwxgtk3.0-gtk3-dev swig libxy-dev liblua5.3-dev
+        curl -LsS -o tests/catch.hpp https://github.com/philsquared/Catch/releases/download/v1.10.0/catch.hpp
+    - name: build
+      run: |
+        g++ --version
+        autoreconf -i
+        ./configure LUA=/usr/bin/lua5.3 LUA_INCLUDE=-I/usr/include/lua5.3 LUA_LIB=-llua5.3
+        make -j2
+        sudo make install
+    - name: test
+      run: |
+        make -j2 check
+        export LD_LIBRARY_PATH=/usr/local/lib
+        cfityk --version
+
+  clang35:
+    name: "Ubuntu 16.04, Clang 3.5"
+    runs-on: ubuntu-16.04
+    if: "!contains(github.event.head_commit.message, '[skip ci]')"
+    env:
+      CC: clang-3.5
+      CXX: clang++-3.5
+    steps:
+    - uses: actions/checkout@v2
+    - name: dependencies
+      run: |
+        sudo apt-get install clang-3.5 cmake libz-dev libxy-dev libboost-dev liblua5.2-dev
+    - name: build
+      run: |
+        $CXX --version
+        cmake --version
+        cmake .
+        make -j2
+        sudo make install
+    - name: test
+      run: |
+        export LD_LIBRARY_PATH=/usr/local/lib
+        cfityk --version

README.md

@@ -5,7 +5,7 @@ Code:         https://github.com/wojdyr/fityk
 Manual:       http://fityk.readthedocs.org/en/latest/  
 Discussions:  http://groups.google.com/group/fityk-users/  
 Building from Source: Read the INSTALL file
-[![Build Status](https://travis-ci.org/wojdyr/fityk.svg?branch=master)](https://travis-ci.org/wojdyr/fityk)
-[![MSVC Build Status](https://ci.appveyor.com/api/projects/status/q2vmyiya4vril835?svg=true)](https://ci.appveyor.com/project/wojdyr/fityk)  
+[![GitHub CI](https://github.com/wojdyr/fityk/workflows/CI/badge.svg)](https://github.com/wojdyr/fityk/actions)
+[![AppVeyor CI](https://ci.appveyor.com/api/projects/status/q2vmyiya4vril835?svg=true)](https://ci.appveyor.com/project/wojdyr/fityk)  
 Citing in academic papers: [J. Appl. Cryst. 43, 1126 (2010)](http://dx.doi.org/10.1107/S0021889810030499) ([reprint](http://wojdyr.github.io/fityk-JAC-10-reprint.pdf))  
 Contact: [email protected]