update to go module and add tests coverage

.github/workflows/coverage.yml

@@ -0,0 +1,53 @@
+name: Test and Generate code coverage badge
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Update coverage badge
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false # otherwise, the token used is the GITHUB_TOKEN, instead of your personal access token.
+          fetch-depth: 0 # otherwise, there would be errors pushing refs to the destination repository.
+
+      - name: Setup go
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: 'go.mod'
+
+      - name: Run Test
+        run: |
+          go test -v ./... -covermode=count -coverprofile=coverage.out
+          go tool cover -func=coverage.out -o=coverage.out
+
+      - name: Go Coverage Badge  # Pass the `coverage.out` output to this action
+        uses: tj-actions/coverage-badge-go@v2
+        with:
+          filename: coverage.out
+
+      - name: Verify Changed files
+        uses: tj-actions/verify-changed-files@v16
+        id: verify-changed-files
+        with:
+          files: README.md
+
+      - name: Commit changes
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+          git add README.md
+          git commit -m "chore: Updated coverage badge."
+
+      - name: Push changes
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ github.token }}
+          branch: ${{ github.head_ref }}

Makefile

@@ -0,0 +1,2 @@
+test:
+	go test ./ ...

README.md

@@ -1,7 +1,10 @@
 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) 
+[![Go Report Card](https://goreportcard.com/badge/github.com/globocom/gothumbor)](https://goreportcard.com/report/github.com/globocom/gothumbor)
+[![Tests](https://github.com/globocom/gothumbor/actions/workflows/coverage.yml/badge.svg)](https://github.com/globocom/gothumbor/actions/workflows/coverage.yml)
+![Coverage](https://img.shields.io/badge/Coverage-93.3%25-brightgreen)
 
 gothumbor allows easy usage of [Thumbor] in Go.
 

go.mod

@@ -0,0 +1,3 @@
+module github.com/globocom/gothumbor
+
+go 1.20