replace ioutil with io package and other minor improvements

hero/container.go

@@ -326,23 +326,28 @@ func Handler(fn interface{}) context.Handler {
 // It returns a standard `iris/context.Handler` which can be used anywhere in an Iris Application,
 // as middleware or as simple route handler or subdomain's handler.
 //
-//  func(...<T>) iris.Handler
+//	func(...<T>) iris.Handler
+//
 // - if <T> are all static dependencies then
 // there is no reflection involved at serve-time.
 //
-//  func(pathParameter string, ...<T>)
+//	func(pathParameter string, ...<T>)
+//
 // - one or more path parameters (e.g. :uid, :string, :int, :path, :uint64)
 // are automatically binded to the first input Go standard types (string, int, uint64 and e.t.c.)
 //
-//  func(<T>) error
+//	func(<T>) error
+//
 // - if a function returns an error then this error's text is sent to the client automatically.
 //
-//  func(<T>) <R>
+//	func(<T>) <R>
+//
 // - The result of the function is a dependency too.
 // If <R> is a request-scope dependency (dynamic) then
 // this function will be called at every request.
 //
-//  func(<T>) <R>
+//	func(<T>) <R>
+//
 // - If <R> is static dependency (e.g. a database or a service) then its result
 // can be used as a static dependency to the next dependencies or to the controller/function itself.
 func (c *Container) Handler(fn interface{}) context.Handler {