chore: release 2.0.0-dev1

[release-please]

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

2.0.0-dev1 (2020-08-20)

⚠ BREAKING CHANGES

• remove v1beta1 surface for v2 (feat!: remove v1beta1 surface for v2 #96)
• Begin using new microgenerator for v2 firestore (feat!: Begin using new microgenerator for v2 firestore #91)
• from firestore-0.30.0: revert to merge not being an option;

Features

• asyncio microgen collection (#119) (6281a67)
• firestore: add IN, ARRAY_CONTAINS_ANY operators; update docstrings (via synth) (#9439) (107e526)
• add client_options to base client class (#150) (f3bedc1)
• add inline type hints and pytype ci (#134) (afff842)
• asyncio microgen batch (#122) (a4e5b00)
• asyncio microgen client (#118) (de4cc44)
• asyncio microgen document (#121) (31faecb)
• asyncio microgen query (#127) (178fa2c)
• asyncio microgen transaction (#123) (35185a8)
• firestore: add v1beta1 deprecation annotation (#34) (b9e2ab5)
• firestore: surface new 'IN' and 'ARRAY_CONTAINS_ANY' operators (#9541) (5e9fe4f)
• asyncio system tests (#132) (4256a85)
• Begin using new microgenerator for v2 firestore (#91) (e0add08)
• create async interface (#61) (eaba25e)
• Create CODEOWNERS (#40) (a0cbf40)
• integrate limit to last (#145) (55da695), closes #57
• remove v1beta1 surface for v2 (#96) (b4a8eb9)
• use DatetimeWithNanoseconds throughout library (#116) (1801ba2)

Bug Fixes

• add mocks to query get tests (#109) (c4c5bfa)
• async_document docs to match expected usecase (#129) (f26f222)
• asyncio microgen client get_all type (#126) (9095368)
• await on to_wrap in AsyncTransactional (#147) (e640e66)
• constructor invalid path tests (#114) (edf7bd1)
• coverage to 99p (8ddfe1d)
• pytype client errors (#146) (eb19712)
• recover watch stream on more error types (#9995) (af5fd1d), closes #L817
• remove six dependency (#110) (6e597f2)
• remove six dependency (#120) (d82687d)
• remove six dependency (#98) (b264ccb), closes #94
• respect transform values passed into collection.add (#7072) (c643d91), closes #6826
• Support more Python sequence types when encoding to Protobuf (#21) (b1c5987)
• type hint improvements (#144) (d30fff8)
• update resume token for restarting BiDi streams (#10282) (61ec5a2)
• firestore: fix get and getall method of transaction (#16) (de3aca0)
• firestore: fix lint (#48) (7fa00c4)
• firestore: simplify 'Collection.add', avoid spurious API call (#9634) (20f093e), closes #9629
• Update team to be in correct org (#43) (bef5a3a)

Documentation

• add python 2 sunset banner to documentation (#9036) (819d154)

• fix intersphinx reference to requests (#9294) (e859f3c)

• firestore: clarify client threadsafety (#9254) (4963eee)

• fix typo in watch documentation (#115) (367ac73)

• normalize use of support level badges (#6159) (6c9f1ac)

• Remove CI for gh-pages, use googleapis.dev for api_core refs. (#9085) (c7b3de8)

• Replace links to '/stable/' with '/latest/'. (#5901) (e2f606e), closes #5894

• firestore: add documentation for Document,Collection .on_snapshot (#9275) (f250443)

• firestore: add new where operators to docstring (#9789) (c3864f7)

• firestore: remove duplicated word in README (#9297) (250024c)

• firestore: standardize use of 'required' and 'optional' in docstrings; add py2 deprecation warning; add 3.8 unit tests (via synth) (#10068) (0f72f2c)

• Refactor conformance tests. (#6291) (4d29c1f), closes #6291 #6290

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Release is at https://github.com/googleapis/python-firestore/releases/tag/v2.0.0-dev1