Use github actions for building

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: Build
+on: [push, pull_request]
+jobs:
+
+  test:
+    runs-on: ubuntu-latest
+    container: nimlang/choosenim
+    strategy:
+      matrix:
+        threads: [on, off]
+        nim: [ 2.0.0, 1.6.14 ]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Choose Nim
+      run: choosenim update -y ${{ matrix.nim }}
+    - name: Safe git directory
+      run: git config --global --add safe.directory "$(pwd)"
+    - name: Test
+      run: nimble --threads:${{ matrix.threads }} test -y

README.md

@@ -1,6 +1,9 @@
-DelaunayNim [![Build Status](https://travis-ci.org/Nycto/DelaunayNim.svg?branch=master)](https://travis-ci.org/Nycto/DelaunayNim)
+DelaunayNim
 ===========
 
+[![Build](https://github.com/Nycto/DelaunayNim/actions/workflows/build.yml/badge.svg)](https://github.com/Nycto/DelaunayNim/actions/workflows/build.yml)
+[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://github.com/Nycto/DelaunayNim/blob/main/LICENSE.md)
+
 A Nim library for calculating the Delaunay Triangulation of a set of points.
 This is accomplished using a divide and conquer algorithm, as described here:
 
@@ -62,4 +65,3 @@ License
 This library is released under the MIT License, which is pretty spiffy. You
 should have received a copy of the MIT License along with this program. If
 not, see http://www.opensource.org/licenses/mit-license.php
-