README.md: v0.24.0 release notes

Also, move some new to old-news.md.

Change-Id: I6337afa9e8acea7d96ee24bf65244ba381043e20
Reviewed-on: https://code-review.googlesource.com/29351
Reviewed-by: Jean de Klerk <[email protected]>

README.md: new release

Not much has changed, but dep users are complaining about the breaking
due to protobuf changes.

Change-Id: If22cd90f18c94d0c014b6cd74d5018b0364cb1ac
Reviewed-on: https://code-review.googlesource.com/27830
Reviewed-by: Jean de Klerk <[email protected]>

README: update news for next release

Change-Id: I968aceaac835f20686f0c2afdc100ee2c1d880b6
Reviewed-on: https://code-review.googlesource.com/27370
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Jonathan Amsterdam <[email protected]>

README: update news for next release

Change-Id: I5a8b65dd7008ddfa7d4aaf50d2330849455c8bd6
Reviewed-on: https://code-review.googlesource.com/26230
Reviewed-by: Jean de Klerk <[email protected]>

README.md: add news for next release

Change-Id: I53c2568728cf045bd30a7f501fd51143ecdc4d8e
Reviewed-on: https://code-review.googlesource.com/25691
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Ramon Nogueira <[email protected]>

README.md: release notes for v0.19.0

Also update version.

I will tag the repo immediately after submission.

Change-Id: I37d99b2ac6e6fcdb50183d058998915be376c292
Reviewed-on: https://code-review.googlesource.com/24250
Reviewed-by: Jean de Klerk <[email protected]>

all: update version and README

Prepare for a new "release" (semver-tagged commit).

Will tag the repo v0.18.0 after this is submitted.

Change-Id: I0c1857abca7bde339be54c459fd2e609ce811c86
Reviewed-on: https://code-review.googlesource.com/22130
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Michael Darakananda <[email protected]>
Reviewed-by: Jonathan Amsterdam <[email protected]>

all: update version and README

Change-Id: Ifd6a52bf281c57e268b142183ddeca3ab95123b0
Reviewed-on: https://code-review.googlesource.com/20470
Reviewed-by: Michael Darakananda <[email protected]>

README.md: release notes for v0.16.0

Change-Id: I019077bc6edb69b07aefbf3c49621d7946d73414
Reviewed-on: https://code-review.googlesource.com/19010
Reviewed-by: Sarah Adams <[email protected]>

README.md: add firestore; move old news

Change-Id: Ie592005cb91caa541ae4c81a08fd8c197ea427af
Reviewed-on: https://code-review.googlesource.com/17490
Reviewed-by: JBD <[email protected]>