Drop Support for go1.8 and go1.9 (#1933)

Author: dmarkham

.travis.yml

@@ -3,8 +3,6 @@ language: go
 matrix:
   fast_finish: true
   include:
-  - go: 1.8.x
-  - go: 1.9.x
   - go: 1.10.x
   - go: 1.11.x
     env: GO111MODULE=on

README.md

@@ -70,7 +70,7 @@ Gin is a web framework written in Go (Golang). It features a martini-like API wi
 
 To install Gin package, you need to install Go and set your Go workspace first.
 
-1. The first need [Go](https://golang.org/) installed (**version 1.8+ is required**), then you can use the below Go command to install Gin.
+1. The first need [Go](https://golang.org/) installed (**version 1.10+ is required**), then you can use the below Go command to install Gin.
 
 ```sh
 $ go get -u github.com/gin-gonic/gin

debug.go

@@ -13,7 +13,7 @@ import (
 	"strings"
 )
 
-const ginSupportMinGoVer = 8
+const ginSupportMinGoVer = 10
 
 // IsDebugging returns true if the framework is running in debug mode.
 // Use SetMode(gin.ReleaseMode) to disable debug mode.
@@ -68,7 +68,7 @@ func getMinVer(v string) (uint64, error) {
 
 func debugPrintWARNINGDefault() {
 	if v, e := getMinVer(runtime.Version()); e == nil && v <= ginSupportMinGoVer {
-		debugPrint(`[WARNING] Now Gin requires Go 1.8 or later and Go 1.9 will be required soon.
+		debugPrint(`[WARNING] Now Gin requires Go 1.10 or later and Go 1.11 will be required soon.
 
 `)
 	}

debug_test.go

@@ -91,7 +91,7 @@ func TestDebugPrintWARNINGDefault(t *testing.T) {
 	})
 	m, e := getMinVer(runtime.Version())
 	if e == nil && m <= ginSupportMinGoVer {
-		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.8 or later and Go 1.9 will be required soon.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
+		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.10 or later and Go 1.11 will be required soon.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	} else {
 		assert.Equal(t, "[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	}