Check compatibility with ESLint 6

[IlCallo]

Most of the tooling around Vue shifted to ESLint 6 in past few weeks, can you check if everything works fine using it and bump dependencies?
Seems like a PR is already there, ready for review #51

[ba55ie]

Yes please! Currently we can't use ecmaVersion: 2020 with support for Dynamic Imports. This results in the error Parsing error: Invalid ecmaVersion, because the espree version is too old.

[juhasev]

Hopefully this gets out soon!

[skyrpex]

I've been using it with version 6 and found no issues to this day.

[pmochine]

[fengerzh]

As eslint-plugin-vue 6.0.0 released, this is the only blocking issue for upgrading to ESlint 6. Please help to solve it. Thanks!

[mysticatea]

Sorry for the lack of my activity. I have released v6.0.5 that fixed this problem.