give a springboot2.1.x example

[brues]

Can you give an example branch about about springboot2.1.x? I think this way is the best way to use security and oauth，but I can not run success on springboot 2.1.x。 And every version of springboot is change a little too much lot，I hope this have enough example。 thanks！

[vskrahul]

@brues you can try this https://github.com/vskrahul/authserver