Release 2.2.2

• Merge pull request #757 from ember-fastboot/revert-755-greenkeeper/release-it-13.0.0 (94c2a6c)
• Revert "Update release-it to the latest version 🚀" (1340196)
• Merge pull request #752 from zonkyio/fastboot-config (2458159)
• Add FastBoot configuration section into README (40b6634)
• Update based on review (1f6c8c2)
• Merge pull request #755 from ember-fastboot/greenkeeper/release-it-13.0.0 (715c5b1)
• Merge pull request #720 from ember-fastboot/greenkeeper/eslint-plugin-ember-7.0.0 (8e10913)
• chore(package): update lockfile yarn.lock (5fa71f5)
• chore(package): update release-it to version 13.0.0 (c48a612)
• Add support for custom configuration (12e121c)
• Re-roll yarn.lock. (#738) (6a5d6c6)
• Re-roll yarn.lock. (60b5eaa)
• Merge pull request #737 from dnalagatla/dnalagatla/fix-custom-app-build (808479b)
• Fix custom app build issue #730 (9ad8446)
• fix typo in property name isFastboot -> isFastBoot (#728) (dea2f93)
• fix typo in property name isFastboot -> isFastBoot (afadb85)
• chore(package): update eslint-plugin-ember to version 7.0.0 (66f56c1)