improve and readme update for v0.5 release

Author: jeevatkm

README.md

@@ -1,9 +1,9 @@
 # log - aah framework
 [![Build Status](https://travis-ci.org/go-aah/log.svg?branch=master)](https://travis-ci.org/go-aah/log) [![codecov](https://codecov.io/gh/go-aah/log/branch/master/graph/badge.svg)](https://codecov.io/gh/go-aah/log/branch/master) [![Go Report Card](https://goreportcard.com/badge/aahframework.org/log.v0)](https://goreportcard.com/report/aahframework.org/log.v0)
-[![Version](https://img.shields.io/badge/version-0.4-blue.svg)](https://github.com/go-aah/log/releases/latest) [![GoDoc](https://godoc.org/aahframework.org/log.v0?status.svg)](https://godoc.org/aahframework.org/log.v0)
+[![Version](https://img.shields.io/badge/version-0.5-blue.svg)](https://github.com/go-aah/log/releases/latest) [![GoDoc](https://godoc.org/aahframework.org/log.v0?status.svg)](https://godoc.org/aahframework.org/log.v0)
 [![License](https://img.shields.io/github/license/go-aah/log.svg)](LICENSE)
 
-***v0.4 [released](https://github.com/go-aah/log/releases/latest) and tagged on Jun 01, 2017***
+***v0.5 [released](https://github.com/go-aah/log/releases/latest) and tagged on Jul 22, 2017***
 
 Simple, flexible & powerful `Go` logger inspired by standard logger & Google glog. aah framework utilizes `log` library across.
 

console_receiver.go

@@ -27,7 +27,7 @@ var (
 		LevelTrace: []byte("\033[0;35m"), // magenta (purple)
 	}
 
-	_ Receiver = &ConsoleReceiver{}
+	_ Receiver = (*ConsoleReceiver)(nil)
 )
 
 // ConsoleReceiver writes the log entry into os.Stderr.

file_receiver.go

@@ -20,7 +20,7 @@ var (
 	// backupTimeFormat is used for timestamp with filename on rotation
 	backupTimeFormat = "2006-01-02-15-04-05.000"
 
-	_ Receiver = &FileReceiver{}
+	_ Receiver = (*FileReceiver)(nil)
 )
 
 // FileReceiver writes the log entry into file.