Reduce boilerplate in a few more service testers [cdnjs continuousphp node shippable wercker gem]

[paulmelnikow]

Follow up to #1934.

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[chris48s]

Looks good 👍

It looks like NPM downloads and Gem downloads also got overlooked in #1934 for some reason:

shields/services/gem/gem-downloads.tester.js

Lines 8 to 13 in ae190c5

	const t = new ServiceTester({
	id: 'gem-downloads',
	title: 'Ruby Gem Downloads',
	pathPrefix: '/gem',
	})
	module.exports = t

shields/services/npm/npm-downloads.tester.js

Lines 9 to 14 in ae190c5

	const t = new ServiceTester({
	id: 'NpmDownloads',
	title: 'NpmDownloads',
	pathPrefix: '/npm',
	})
	module.exports = t

was that oversight, or is there something we're waiting on for those? (like with APM)

[paulmelnikow]

I thought I responded to this comment, though I don't see it now. 🤔

I updated gem-downloads. npm-downloads can't be handled using this shortcut, because that module exposes four separate services.

This should be good to merge!