Replace travis with github actions

.github/workflows/unittests.yml

@@ -0,0 +1,26 @@
+name: unittests
+
+on:
+  push:
+  pull_request:
+    types: [opened, reopened]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: ['1.19.x', '1.20.x', '1.21.x']
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: tests
+        run: |
+          go install github.com/axw/gocov/gocov@latest
+          go install github.com/mattn/goveralls@latest
+          if ! go install github.com/golang/tools/cmd/cover@latest; then go install golang.org/x/tools/cmd/cover@latest; fi
+          go test -v -covermode=count -coverprofile=coverage.out
+          test -z $(gofmt -l .)

README.md

@@ -1,7 +1,7 @@
 gothumbor
 =========
 
-[![GoDoc](https://godoc.org/github.com/globocom/gothumbor?status.svg)](https://godoc.org/github.com/globocom/gothumbor) [![Build Status](https://travis-ci.org/globocom/gothumbor.svg?branch=master)](https://travis-ci.org/globocom/gothumbor) [![Coverage Status](https://coveralls.io/repos/globocom/gothumbor/badge.svg?branch=master&service=github)](https://coveralls.io/github/globocom/gothumbor?branch=master)
+[![GoDoc](https://godoc.org/github.com/globocom/gothumbor?status.svg)](https://godoc.org/github.com/globocom/gothumbor)
 
 gothumbor allows easy usage of [Thumbor] in Go.