chore: release 2.0.0

[github-actions]

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

2.0.0 (2021-04-16)

⚠ BREAKING CHANGES

• 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 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)
• unmarshaller: remove asynchronous 0.3 unmarshaller API (#126) (63ae1ad)
• use CloudEvents not cloudevents everywhere (#101) (05ecbde)

Bug Fixes

• ensure binary events can handle no content-type header (#134) (72a87df)
• Fix Express example installation (#77) (bb8e0f9)
• make application/json the default content type in binary mode (#118) (d9e9ae6)
• misspelled word (#113) (cd6a3ee)
• misspelled word (#115) (53524ac)
• protects the consts from being changed in other parts of the code. (fbcbcec)
• remove d.ts types. Fixes #83 (#84) (6c223e2)
• support mTLS in 1.0 Binary and Structured emitters (3a063d7)
• throw "no cloud event detected" if one can't be read (#139) (ef7550d)

Tests

• remove uuid require in spec_03_tests.js (#145) (c56c203)
• use constants in spec_03_tests.js (#144) (2882aff)
• use header constants in receiver tests (#131) (60bf05c)
• use header constants in unmarshaller tests (#60) (e087805)

Miscellaneous

• add action to detect and close stale issues (5a6cde5)
• add eslint configuration and npm script (3f238a0)
• add npm fix command (#74) (005d532)
• add standard-version and release script (f47bca4)
• adds files section in package.json (#147) (f8a62b2)
• es6 base64 parser (#75) (d042ef1)
• es6 parser (#98) (cd6decd)
• es6 unmarshaller (#108) (79ec3ef)
• fix CI code coverage publishing (#78) (8fb0ddf)
• Modify CI to also build backport branch(es) (#122) (c1fda94)
• remove note with bad link and non SDK docs (#109) (f30c814)
• update eslint rules to disallow var usage (e83db29)
• Update uuid dependency (42246ce)
• use es6 for cloudevents.js (#73) (12ac181)

Documentation

• add instructions and details to contributors guide (#105) (fd99cb1)
• add JSDocs for top level API objects (#140) (b283583)
• organize README badges and remove TS example (#112) (07323e0)
• remove 0.1, 0.2 spec support from README (56036b0)
• remove repo structure docs (#111) (223a7c6)
• update README and examples with new API (#138) (b866edd)

lib

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

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