add go version prerequisite and debug warning

README.md

@@ -15,6 +15,8 @@ Gin is a web framework written in Go (Golang). It features a martini-like API wi
 
 ## Contents
 
+- [Installation](#installation)
+- [Prerequisite](#prerequisite)
 - [Quick start](#quick-start)
 - [Benchmarks](#benchmarks)
 - [Gin v1.stable](#gin-v1-stable)
@@ -57,6 +59,18 @@ Gin is a web framework written in Go (Golang). It features a martini-like API wi
 - [Testing](#testing)
 - [Users](#users--)
 
+## Installation
+
+To install Gin package, you need to install Go and set your Go workspace. The simplest way to install the library is to run:
+
+```sh
+$ go get -u github.com/gin-gonic/gin
+```
+
+## Prerequisite
+
+Now Gin requires Go 1.6 or later and Go 1.7 will be required soon.
+
 ## Quick start
  
 ```sh

debug.go

@@ -47,6 +47,9 @@ func debugPrint(format string, values ...interface{}) {
 }
 
 func debugPrintWARNINGDefault() {
+	debugPrint(`[WARNING] Now Gin requires Go 1.6 or later and Go 1.7 will be required soon.
+
+`)
 	debugPrint(`[WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.
 
 `)

debug_test.go

@@ -92,7 +92,7 @@ func TestDebugPrintWARNINGDefault(t *testing.T) {
 	defer teardown()
 
 	debugPrintWARNINGDefault()
-	assert.Equal(t, "[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", w.String())
+	assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.6 or later and Go 1.7 will be required soon.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", w.String())
 }
 
 func TestDebugPrintWARNINGNew(t *testing.T) {