update examples link in README (#1789)

README.md

@@ -359,7 +359,7 @@ ids: map[b:hello a:1234], names: map[second:tianou first:thinkerou]
 
 #### Single file
 
-References issue [#774](https://github.com/gin-gonic/gin/issues/774) and detail [example code](examples/upload-file/single).
+References issue [#774](https://github.com/gin-gonic/gin/issues/774) and detail [example code](https://github.com/gin-gonic/examples/tree/master/upload-file/single).
 
 `file.Filename` **SHOULD NOT** be trusted. See [`Content-Disposition` on MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition#Directives) and [#1693](https://github.com/gin-gonic/gin/issues/1693)
 
@@ -394,7 +394,7 @@ curl -X POST http://localhost:8080/upload \
 
 #### Multiple files
 
-See the detail [example code](examples/upload-file/multiple).
+See the detail [example code](https://github.com/gin-gonic/examples/tree/master/upload-file/multiple).
 
 ```go
 func main() {
@@ -726,7 +726,7 @@ When running the above example using the above the `curl` command, it returns er
 
 ### Custom Validators
 
-It is also possible to register custom validators. See the [example code](examples/custom-validation/server.go).
+It is also possible to register custom validators. See the [example code](https://github.com/gin-gonic/examples/tree/master/custom-validation/server.go).
 
 ```go
 package main
@@ -790,7 +790,7 @@ $ curl "localhost:8085/bookable?check_in=2018-03-08&check_out=2018-03-09"
 ```
 
 [Struct level validations](https://github.com/go-playground/validator/releases/tag/v8.7) can also be registered this way.
-See the [struct-lvl-validation example](examples/struct-lvl-validations) to learn more.
+See the [struct-lvl-validation example](https://github.com/gin-gonic/examples/tree/master/struct-lvl-validations) to learn more.
 
 ### Only Bind Query String
 
@@ -1280,7 +1280,7 @@ You may use custom delims
 
 #### Custom Template Funcs
 
-See the detail [example code](examples/template).
+See the detail [example code](https://github.com/gin-gonic/examples/tree/master/template).
 
 main.go
 
@@ -1654,7 +1654,7 @@ An alternative to endless:
 * [graceful](https://github.com/tylerb/graceful): Graceful is a Go package enabling graceful shutdown of an http.Handler server.
 * [grace](https://github.com/facebookgo/grace): Graceful restart & zero downtime deploy for Go servers.
 
-If you are using Go 1.8, you may not need to use this library! Consider using http.Server's built-in [Shutdown()](https://golang.org/pkg/net/http/#Server.Shutdown) method for graceful shutdowns. See the full [graceful-shutdown](./examples/graceful-shutdown) example with gin.
+If you are using Go 1.8, you may not need to use this library! Consider using http.Server's built-in [Shutdown()](https://golang.org/pkg/net/http/#Server.Shutdown) method for graceful shutdowns. See the full [graceful-shutdown](https://github.com/gin-gonic/examples/tree/master/graceful-shutdown) example with gin.
 
 ```go
 // +build go1.8
@@ -1758,7 +1758,7 @@ func loadTemplate() (*template.Template, error) {
 }
 ```
 
-See a complete example in the `examples/assets-in-binary` directory.
+See a complete example in the `https://github.com/gin-gonic/examples/tree/master/assets-in-binary` directory.
 
 ### Bind form-data request with custom struct