add more licence and copyright info

Alexander Félix · Alexander Félix · commit 277f95eabdd9 · 2020-04-10T12:16:13.000+02:00
diff --git a/README.md b/README.md
@@ -1,6 +1,6 @@
 # Go overwrite
 
-[![GoDoc](https://img.shields.io/static/v1?label=godoc&message=reference&color=blue)](https://pkg.go.dev/github.com/phelian/overwrite)
+[![GoDoc](https://img.shields.io/static/v1?label=godoc&message=reference&color=blue)](https://pkg.go.dev/github.com/phelian/overwrite) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 Currently, overwrite requires Go version 1.13 or greater.
 
diff --git a/do.go b/do.go
@@ -1,3 +1,7 @@
+// Copyright 2020 Alexander Félix. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
 package overwrite
 
 import (
diff --git a/do_test.go b/do_test.go
@@ -1,3 +1,7 @@
+// Copyright 2020 Alexander Félix. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
 package overwrite
 
 import (
diff --git a/tag.go b/tag.go
@@ -1,3 +1,7 @@
+// Copyright 2020 Alexander Félix. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
 package overwrite
 
 import (
diff --git a/tag_test.go b/tag_test.go
@@ -1,3 +1,7 @@
+// Copyright 2020 Alexander Félix. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
 package overwrite
 
 import (
