chore: release 4.0.0

[github-actions]

🤖 I have created a release *beep* *boop*

4.0.0 (2020-08-26)

⚠ BREAKING CHANGES

• This validates the value of the cloud event extension based on the spec,
• This changes the modules name from cloudevents-sdk to cloudevents
• src: * Extension names are now validated during object creation. The values are defined by the specification, and can be lowercase(a-z) or digits(0-9) and must be no longer that 20 characters
• src: * This change makes the CloudEvent Read-only and validates the input during object creation.
• change CloudEvent to use direct object notation and get/set properties (lib!: change CloudEvent to use direct object notation and get/set properties cloudevents/sdk-javascript#172)
• refactor HTTP bindings and specifications (lib!: refactor HTTP bindings and specifications cloudevents/sdk-javascript#165)
• expose a version agnostic event emitter (feat!: expose a version agnostic event emitter cloudevents/sdk-javascript#141)
• unmarshaller: remove asynchronous 0.3 unmarshaller API (feat(unmarshaller)!: remove asynchronous 0.3 unmarshaller API cloudevents/sdk-javascript#126)

Features

• add types to package.json (#216) (4265281)
• add ValidationError type extending TypeError (#151) (09b0c76)
• expose a mode and version agnostic event receiver (#120) (54f242b)
• expose a version agnostic event emitter (#141) (250a0a1)
• formatter.js es6 (#87) (c36f194)
• introduce browser support (#201) (8b2725b)
• pass extension into the constructor. (#214) (0378f4c), closes #209
• remove unused plugins (#262) (4014da2)
• simplify validation logic/imports (#265) (4b54b27)
• use npm name cloudevents (#260) (565f867), closes #215
• src: A CloudEvent should be readonly but provide a way to augment itself. (#234) (c7a8477)
• src: add ext name validation (#246) (84f1ed9)
• unmarshaller: remove asynchronous 0.3 unmarshaller API (#126) (63ae1ad)
• use CloudEvents not cloudevents everywhere (#101) (05ecbde)

Bug Fixes

• Add Correct Headers to emitted Binary Event (#302) (ad0c434), closes #301
• add correct types to improve TypeScript behavior (#202) (da365e0)
• do not require an HTTP body on incoming binary event messages (a7c326b)
• ensure binary events can handle no content-type header (#134) (72a87df)
• ensure that data encoded as base64 is parsed as an object (#285) (ed9ea95)
• ensure that event data can be an array, number, boolean or null (#281) (b99f728)
• ensure that the HTTP receiver sanitizes headers in accept() (#239) (51035dc)
• Fix Express example installation (#77) (bb8e0f9)
• fix references to constants - remove .js extension (#200) (c757a2b)
• initialize CloudEvent's extensions property (#192) (0710166)
• introduce CloudEventV1 and CloudEventV03 interfaces (#194) (a5befbe)
• make application/json the default content type in binary mode (#118) (d9e9ae6)
• misspelled word (#113) (cd6a3ee)
• misspelled word (#115) (53524ac)
• package.json & package-lock.json to reduce vulnerabilities (#253) (2ed5f84)
• parse method mutating its input (#231) (060b21b)
• protects the consts from being changed in other parts of the code. (fbcbcec)
• remove d.ts types. Fixes #83 (#84) (6c223e2)
• throw "no cloud event detected" if one can't be read (#139) (ef7550d)
• update browser name to cloudevents. (#292) (48d182b), closes #286
• upgrade uuid from 8.0.0 to 8.1.0 (#220) (25077a9)
• upgrade uuid from 8.1.0 to 8.2.0 (#250) (13bcdb4)
• use /lib in gitignore so src/lib is not ignored (#199) (fba3294)

lib

• change CloudEvent to use direct object notation and get/set properties (#172) (abc114b)
• refactor HTTP bindings and specifications (#165) (6f0b5ea)
• validate extension values (#251) (3c8273f)

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