Vue-cli-service: make vue-template-compiler a peerDependencie

[AlexandreBonaventure]

What problem does this feature solve?

If you are using vue-cli without the latest vue, the CLI will throw a Vue packages version mismatch because it is always downloading the latest vue-template-compiler in https://github.com/vuejs/vue-cli/blob/dev/packages/%40vue/cli-service/package.json#L65

What does the proposed API look like?

Making vue-template a peer dependencie would solve the issue and allow to set a specific version of vue-template-compiler in your project specific package.json.