chore: release 2.0.0

[release-please]

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

2.0.0 (2020-07-22)

⚠ BREAKING CHANGES

• remove deprecated getCollections() methods (chore!: remove deprecated getCollections() methods #307)
• various renames due to generator changes

Miscellaneous Chores

• enable gapicv2 (#188) (92224bc), closes /github.com/googleapis/googleapis/blob/6f8350c0df231d7e742fa10dbf929f33047715c9/google/firestore/admin/v1/firestore_gapic.yaml#L24-L29 /github.com/googleapis/googleapis/blob/6f8350c0df231d7e742fa10dbf929f33047715c9/google/firestore/admin/v1/field.proto#L39
• remove deprecated getCollections() methods (#307) (bb4ddf1)

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This PR was generated with Release Please.

[codecov]

Codecov Report

Merging #298 into master will increase coverage by 0.42%.
The diff coverage is n/a.

@@ Coverage Diff @@ ## master #298 +/- ## ============================================ + Coverage 73.22% 73.65% +0.42%  - Complexity 1029 1069 +40  ============================================ Files 64 64 Lines 5654 5784 +130 Branches 625 645 +20 ============================================ + Hits 4140 4260 +120  - Misses 1312 1316 +4  - Partials 202 208 +6 

Impacted Files	Coverage Δ	Complexity Δ
...oogle/cloud/firestore/v1/FirestoreAdminClient.java	57.46% <0.00%> (-1.89%)	38.00% <0.00%> (+8.00%)	⬇️
.../com/google/cloud/firestore/CustomClassMapper.java	77.57% <0.00%> (-0.14%)	109.00% <0.00%> (ø%)
...oogle/cloud/firestore/spi/v1/GrpcFirestoreRpc.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...restore/collection/ImmutableSortedMapIterator.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
.../com/google/cloud/firestore/UserDataConverter.java	97.53% <0.00%> (+0.03%)	24.00% <0.00%> (ø%)
...rc/main/java/com/google/cloud/firestore/Watch.java	91.66% <0.00%> (+0.11%)	56.00% <0.00%> (ø%)
.../firestore/v1/stub/FirestoreAdminStubSettings.java	86.73% <0.00%> (+0.13%)	23.00% <0.00%> (+1.00%)
...rc/main/java/com/google/cloud/firestore/Query.java	88.09% <0.00%> (+0.25%)	128.00% <0.00%> (+7.00%)
...cloud/firestore/v1/stub/FirestoreStubSettings.java	82.30% <0.00%> (+0.27%)	25.00% <0.00%> (+1.00%)
.../firestore/v1beta1/stub/FirestoreStubSettings.java	82.35% <0.00%> (+0.32%)	23.00% <0.00%> (+1.00%)
... and 9 more

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