Disable package-lock.json

[non25]

This ensures users will get up to date version of svelte-hmr without us
needing to republish svelte-loader with bumped version

[non25]

It also fixes this https://github.com/rixo/svelte-hmr/pull/23 for Yarn 2 PnP.

[Conduitry]

package-lock.json is not considered when someone is installing a library as a dependency. It's not even part of the published package. (https://unpkg.com/svelte-loader@2.13.6/package-lock.json) If package.json contains "svelte-hmr": "^0.12.2" then this will already resolve to 0.12.3 for new installations.

[non25]

Okay then. 😄