Add GitHub actions for tests and update README.md

.github/workflows/lint.yml

@@ -0,0 +1,14 @@
+on: [push, pull_request]
+
+name: Lint
+
+jobs:
+  golangci:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.31

.github/workflows/tests.yml

@@ -0,0 +1,20 @@
+on: [push, pull_request]
+
+name: Test
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.16.x]
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Test
+        run: go test ./...

README.md

@@ -1,6 +1,6 @@
 consistent
 ==========
-[![GoDoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/buraksezer/consistent) [![Build Status](https://travis-ci.org/buraksezer/consistent.svg?branch=master)](https://travis-ci.org/buraksezer/consistent) [![Coverage](http://gocover.io/_badge/github.com/buraksezer/consistent)](http://gocover.io/github.com/buraksezer/consistent) [![Go Report Card](https://goreportcard.com/badge/github.com/buraksezer/consistent)](https://goreportcard.com/report/github.com/buraksezer/consistent) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Mentioned in Awesome Go](https://awesome.re/mentioned-badge.svg)](https://github.com/avelino/awesome-go)  
+[![Go Reference](https://pkg.go.dev/badge/github.com/buraksezer/consistent.svg)](https://pkg.go.dev/github.com/buraksezer/consistent) ![Build Status](https://github.com/buraksezer/consistent/actions/workflows/tests.yml/badge.svg?branch=master) ![Linter](https://github.com/buraksezer/consistent/actions/workflows/lint.yml/badge.svg?branch=master) [![Coverage](http://gocover.io/_badge/github.com/buraksezer/consistent)](http://gocover.io/github.com/buraksezer/consistent) [![Go Report Card](https://goreportcard.com/badge/github.com/buraksezer/consistent)](https://goreportcard.com/report/github.com/buraksezer/consistent) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Mentioned in Awesome Go](https://awesome.re/mentioned-badge.svg)](https://github.com/avelino/awesome-go)  
 
 
 This library provides a consistent hashing function which simultaneously achieves both uniformity and consistency.