Move "good" badge helpers from lib/ to services/ (#3101)

This moves a few helpers from `lib/` to `services/`:

build-status.js
build-status.spec.js
color-formatters.js
color-formatters.spec.js
contributor-count.js
licenses.js
licenses.spec.js
php-version.js
php-version.spec.js
text-formatters.js
text-formatters.spec.js
version.js
version.spec.js

And one from `lib/` to `core/`:

unhandled-rejection.spec.js

The diff is long, but the changes are straightforward.

Ref #2832

services/pub/pub.service.js

@@ -2,8 +2,7 @@
 
 const Joi = require('joi')
 const { BaseJsonService } = require('..')
-const { renderVersionBadge } = require('../../lib/version')
-const { latest: latestVersion } = require('../../lib/version')
+const { latest, renderVersionBadge } = require('../version')
 
 const schema = Joi.object({
   versions: Joi.array()
@@ -57,7 +56,7 @@ module.exports = class PubVersion extends BaseJsonService {
     const data = await this.fetch({ packageName })
     const includePre = which === 'vpre'
     const versions = data.versions
-    const version = latestVersion(versions, { pre: includePre })
+    const version = latest(versions, { pre: includePre })
     return renderVersionBadge({ version })
   }
 }