v6.4.0

What's Changed

• Bump http-cache-semantics from 4.1.0 to 4.1.1 by @dependabot in #65
• Bump minimist from 0.2.2 to 0.2.4 by @dependabot in #67
• Move to ember-cli@4.11 by @onechiporenko in #68

Full Changelog: v6.3.0...v6.4.0