changed default filename from 'manifest.json' to 'manifest.webmanifest'

[mojoaxel]

Thanks for this plugin! 👍

This pull requests changes the default filename from manifest.json to manifest.webmanifest because this is (now) the recommended filename and extension by the W3C:

• https://www.w3.org/TR/appmanifest/#media-type-registration
• https://www.w3.org/TR/appmanifest/#using-a-link-element-to-link-to-a-manifest

Here is the discussion:

• The use of the .manifest file extension may be problematic / confusing ? w3c/manifest#346
• .json in MIME registration is causing problems. w3c/manifest#381

Some browser vendors also already adopted there docs:

• https://developer.mozilla.org/en-US/docs/Web/Manifest

I would consider this a major change so maybe this is something for the major 2.0 release?

[codecov-io]

Codecov Report

Merging #106 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #106   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines          78     78           
=====================================
  Hits           78     78

Impacted Files	Coverage Δ
lib/plugin.js	100% <ø> (ø)	⬆️

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[mojoaxel]

Sorry my mistake. Wrong manifest.json ;-)