4.8.0

Option unknownFormats to fail schema compilation if unknown format is used or fail validation if unknown format is in v5 $data reference (#310)
Support for generating standalone module exporting a validation function to be used without Ajv (using ajv-cli)

Fixes:

• replace eval with Function constructor
• $data: allow null as schema value in keywords that support $data reference (#305)
• $ref: support escaped characters (#311)
• format hostname: allow segments of hostnames to start with digit (#312)
• extendRef option: do NOT log warning if explicitely set to true (#303)