Updated package.json to reflect recent changes.

[mastrzyz]

There were recent changes done around WP4/WP5 compatibility that should be done with a package.json version update so we can consume them.

[coveralls]

Coverage remained the same at 100.0% when pulling eeda2d5 on mastrzyz:master into b1e29f6 on sueddeutsche:master.

[mastrzyz]

@benurb benurb