Allow defining a custom extension for the file .webmanifest

[ahoys]

Chrome developer tools give the following tip when using this plugin: Web app manifest should have the filename extension 'webmanifest'.

Which indeed seems to be the standardized extension for a manifest file. https://webhint.io/docs/user-guide/hints/hint-manifest-file-extension/?source=devtools

Could we have an option to define the file extension with ManifestOptions?

[Stanzilla]

Chrome developer tools give the following tip when using this plugin: Web app manifest should have the filename extension 'webmanifest'.

Which indeed seems to be the standardized extension for a manifest file. webhint.io/docs/user-guide/hints/hint-manifest-file-extension/?source=devtools

Could we have an option to define the file extension with ManifestOptions?

That's a bit wrong, see https://www.w3.org/TR/appmanifest/#:~:text=NOTE%3A%20File%20extension%3A%20.webmanifest%20or%20.json%3F