fix: replace existing route in addRoute show warning msg

[qiuzuhui]

fix: addRoute is not work when there is already route with same name. replaced existing route in addRoute and show warning msg

[hendrikheil]

Would love to see this merged. We currently have to use a fork to get the documented behavior, which is not ideal

Tested this and can confirm it works as expected :+1:

[9-lives]

没有人 merge 吗？

[772778995]

Niubitli！！

[Cheaterman]

VueJS please fix

[sonicwang1989]

+1

[panruza]

+1