update the golang compiler version and the versions of several dependencies

Signed-off-by: Tariq Ibrahim <tariq181290@gmail.com>

vendor/google.golang.org/appengine/appengine.go

@@ -17,16 +17,77 @@ import (
 	"google.golang.org/appengine/internal"
 )
 
+// The gophers party all night; the rabbits provide the beats.
+
+// Main is the principal entry point for an app running in App Engine.
+//
+// On App Engine Flexible it installs a trivial health checker if one isn't
+// already registered, and starts listening on port 8080 (overridden by the
+// $PORT environment variable).
+//
+// See https://cloud.google.com/appengine/docs/flexible/custom-runtimes#health_check_requests
+// for details on how to do your own health checking.
+//
+// On App Engine Standard it ensures the server has started and is prepared to
+// receive requests.
+//
+// Main never returns.
+//
+// Main is designed so that the app's main package looks like this:
+//
+//      package main
+//
+//      import (
+//              "google.golang.org/appengine"
+//
+//              _ "myapp/package0"
+//              _ "myapp/package1"
+//      )
+//
+//      func main() {
+//              appengine.Main()
+//      }
+//
+// The "myapp/packageX" packages are expected to register HTTP handlers
+// in their init functions.
+func Main() {
+	internal.Main()
+}
+
 // IsDevAppServer reports whether the App Engine app is running in the
 // development App Server.
 func IsDevAppServer() bool {
 	return internal.IsDevAppServer()
 }
 
+// IsStandard reports whether the App Engine app is running in the standard
+// environment. This includes both the first generation runtimes (<= Go 1.9)
+// and the second generation runtimes (>= Go 1.11).
+func IsStandard() bool {
+	return internal.IsStandard()
+}
+
+// IsFlex reports whether the App Engine app is running in the flexible environment.
+func IsFlex() bool {
+	return internal.IsFlex()
+}
+
+// IsAppEngine reports whether the App Engine app is running on App Engine, in either
+// the standard or flexible environment.
+func IsAppEngine() bool {
+	return internal.IsAppEngine()
+}
+
+// IsSecondGen reports whether the App Engine app is running on the second generation
+// runtimes (>= Go 1.11).
+func IsSecondGen() bool {
+	return internal.IsSecondGen()
+}
+
 // NewContext returns a context for an in-flight HTTP request.
 // This function is cheap.
 func NewContext(req *http.Request) context.Context {
-	return WithContext(context.Background(), req)
+	return internal.ReqContext(req)
 }
 
 // WithContext returns a copy of the parent context