CloudEvents v5.0.0

⚠ BREAKING CHANGES

• remove support for 0.3 events (#425)

Features

• add native logging with headers and body to CloudEvent (#437) (b38a48f)

Bug Fixes

• update express example with framework features. (#429) (272bcea), closes #379
• ensure source property has min length of 1 (#438) (2ff7852)
• package.json & package-lock.json to reduce vulnerabilities (#433) (cf47248)
• package.json & package-lock.json to reduce vulnerabilities (#434) (8814919)
• package.json & package-lock.json to reduce vulnerabilities (#436) (2dc846c)

Miscellaneous

• remove node 10 from ci (#435) (a7db466)
• remove support for 0.3 events (#425) (2bd9a5a)
• update eslint and prettier dependencies (#424) (061c122)
• use git submodules for conformance tests (#427) (2118488)