v1.5.1

What's Changed

• Removed unneeded call to buildValidator in Valid constructor.
• Uses ATOM constant in DateTimeInterface to format date/time in ISO8601.
• Fixed tests for base64 URL encoding and decoding.
• Bump dependabot/fetch-metadata from 1.3.5 to 1.3.6 by @dependabot in #19

Full Changelog: v1.5.0...v1.5.1