use github actions for build instead of travis (#14)

Author: dastrobu

.github/workflows/ci.yaml

@@ -0,0 +1,24 @@
+name: ci
+on:
+  - push
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: norio-nomura/action-swiftlint@3.2.1
+  macos-test:
+    strategy:
+      matrix:
+        swift-version:
+          - "5.5"
+          - "5.4"
+          - "5.3"
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: fwal/setup-swift@v1
+        with:
+          swift-version: ${{ matrix.swift-version }}
+      - run: swift test

.travis.yml

@@ -1,8 +1,8 @@
 # AccelerateArray
 
-[![Swift Version](https://img.shields.io/badge/swift-5.3-blue.svg)](https://swift.org) 
-![Platform](https://img.shields.io/badge/platform-osx--64-lightgray.svg)
-[![Build Travis-CI Status](https://travis-ci.org/dastrobu/AccelerateArray.svg?branch=master)](https://travis-ci.org/dastrobu/AccelerateArray) 
+[![Swift Version](https://img.shields.io/badge/swift-5.5-blue.svg)](https://swift.org)
+![Platform](https://img.shields.io/badge/platform-macOS-lightgray.svg)
+![Build](https://github.com/dastrobu/AccelerateArray/actions/workflows/ci.yaml/badge.svg)
 [![documentation](https://github.com/dastrobu/AccelerateArray/raw/master/docs/badge.svg?sanitize=true)](https://dastrobu.github.io/AccelerateArray/)
 
 Swift Array Extensions for the Apple Accelerate Framework.