Update peerDependencies

[dcyriller]

Fix the peerDependencies to indicate that this plugin is supposed to work with ember-template-lint starting from v2.10.0 and prettier starting v1.18.1.

If ember-template-lint would release a new major that breaks the compatibility with this plugin, this event would be treated as a bug in this plugin.

eslint-plugin-ember and eslint-plugin-prettier have the same policy.

[Turbo87]

was it intentional that this will also target e.g. ember-template-lint v42.3.1?

[dcyriller]

The peerDependency indicates that this plugin is supposed to work with ember-template-lint starting from v2.10.0. But ember-template-lint could release a new major that breaks the compatibility with this plugin. This event would be treated as a bug in this plugin.

eslint-plugin-ember and eslint-plugin-prettier made that choice:
https://github.com/ember-cli/eslint-plugin-ember/blob/79d2a949537f568474124a53158d559a00e8161c/package.json#L94
https://github.com/prettier/eslint-plugin-prettier/blob/76bd45ece6d56eb52f75db6b4a1efdd2efb56392/package.json#L34-L35

In term of maintenance, I think I'd rather fix the bug when a major change in ember-template-lint breaks the compatibilty with this addon than increase the compatibilty range every time ember-template-lint publises a new major.

wdyt?

[Turbo87]

yeah, sounds reasonable. just wasn't sure if it was intentional since the PR description was empty 😅