Release v4.5.1

Merge pull request #116 from mailtrap/release-v4.5.0

Release v4.5.0

4.4.0-beta.0

Merge pull request #112 from mailtrap/fix-import-issue

Add ES module support by specifying import path in package.json

Merge pull request #108 from mailtrap/fix-106

Fix 106

Merge pull request #85 from railsware/dynamic-user-agent

Dynamic user agent

Bump version to v4.2.0

Bump version to v4.1.0

Fix typo

3.5.0