8.0.0

• 8dbce14 Refactor readme.md
• debc4d9 Add notes about compilers and non-string results
• 5970143 Move types from dependencies to dev-dependencies
• 4d96f98 Add support for using ES classes to parse, compile
• 15a052a Remove dependency
• 9dc09b1 Update is-plain-obj (see is-plain-obj@2.0.0)
• fa95ea9 Update vfile (see vfile@4.0.0)
• 36645fc Refactor typings