v1.5.16

What's Changed

• Technical/Update CircleCI config by @bestwebua in #108
• Technical/Update CircleCI config by @bestwebua in #109
• Technical/Update default gemspec by @bestwebua in #110
• Technical/Update CircleCI Ruby image by @bestwebua in #111
• Technical/Update gem development dependencies by @bestwebua in #112
• Technical/Update gem development dependencies by @bestwebua in #113
• Technical/Change RSpec helpers namespace by @bestwebua in #114
• Ruby DnsMock v1.5.16 by @bestwebua in #115

Full Changelog: v1.5.15...v1.5.16