v1.3.5

What's Changed

• Technical/Update CircleCI config by @bestwebua in #72
• Technical/Update CircleCI config by @bestwebua in #73
• Technical/Update default gemspec by @bestwebua in #74
• Technical/Update CircleCI Ruby image by @bestwebua in #75
• Technical/Update gem development dependencies by @bestwebua in #76
• Technical/Update gem development dependencies by @bestwebua in #77
• Technical/Update gem version by @bestwebua in #78
• Ruby SmtpMock v1.3.5 by @bestwebua in #79

Full Changelog: v1.3.4...v1.3.5