Moderize code and documentation

Author: nightlyone

README.md

@@ -1,7 +1,7 @@
 # atomic
 Atomic operations as methods on types
 
-[![GoDoc](https://godoc.org/github.com/nightlyone/atomic?status.svg)](https://godoc.org/github.com/nightlyone/atomic)
+[![Go Reference](https://pkg.go.dev/badge/github.com/nightlyone/atomic.svg)](https://pkg.go.dev/github.com/nightlyone/atomic)
 [![Build Status](https://secure.travis-ci.org/nightlyone/atomic.png)](https://travis-ci.org/nightlyone/atomic)
 
 # example usage

bool.go

@@ -12,7 +12,7 @@ type Bool struct {
 
 // NewBool returns a new atomic boolean set inititially to value.
 func NewBool(value bool) *Bool {
-	if value == true {
+	if value {
 		return &Bool{i: 1}
 	}
 	return &Bool{}
@@ -37,9 +37,9 @@ func (b *Bool) CompareAndSwap(old, new bool) (swapped bool) {
 	ref := &b.i
 
 	switch {
-	case old == false && new == true:
+	case !old && new:
 		return atomic.CompareAndSwapUint64(ref, 0, 1)
-	case old == true && new == false:
+	case old && !new:
 		return atomic.CompareAndSwapUint64(ref, 1, 0)
 	default:
 		// this case is nonsense, since a swap will never happen.

bool_test.go

@@ -6,7 +6,7 @@ import (
 	"github.com/nightlyone/atomic"
 )
 
-// Service is a flaky service
+// Service is a flaky service.
 type Service struct {
 	health atomic.Bool
 }