Add CI using GitHub Actions (#1) -- Thanks oprypin!

* Crystal 0.36 compatibility

* Add CI using GitHub Actions

Co-authored-by: Matthew Berry <me@mattrb.com>

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          # - windows-latest
+    runs-on: ${{matrix.os}}
+    env:
+      SHARDS_OPTS: --ignore-crystal-version
+    steps:
+      - name: Download source
+        uses: actions/checkout@v2
+
+      - name: Install Crystal
+        uses: oprypin/install-crystal@v1
+
+      - name: Install SDL2
+        if: runner.os == 'Linux'
+        run: sudo apt-get -y install libsdl2-dev
+      - name: Install SDL2
+        if: runner.os == 'macOS'
+        run: brew install sdl2
+      - name: Install SDL2
+        if: runner.os == 'Windows'
+        run: |
+          iwr https://www.libsdl.org/release/SDL2-devel-2.0.10-VC.zip -OutFile sdl2.zip
+          7z x sdl2.zip
+          mv SDL2-* sdl2
+          echo "INCLUDE=$(pwd)\sdl2\include:${env:INCLUDE}" >>${env:GITHUB_ENV}
+          echo "LIB=$(pwd)\sdl2\lib\x64:${env:LIB}" >>${env:GITHUB_ENV}
+
+      - name: Install shards
+        run: shards install
+      - name: Build
+        run: shards build
+      # - name: Run tests
+      #   run: crystal spec

.travis.yml

@@ -1,6 +0,0 @@
-language: crystal
-
-# Uncomment the following if you'd like Travis to run specs and check code formatting
-# script:
-#   - crystal spec
-#   - crystal tool format --check

shard.yml

@@ -15,7 +15,7 @@ dependencies:
     github: mattrberry/bitfield
     version: 0.1.3
   sdl:
-    git: git@github.com:ysbaddaden/sdl.cr.git
+    github: ysbaddaden/sdl.cr
   lib_gl:
     github: nulldotpro/LibGL