Bump error_prone_core from 2.3.2 to 2.3.3 (#40)
Bump error_prone_core from 2.3.2 to 2.3.3 (#40)

Bumps [error_prone_core](https://github.com/google/error-prone) from 2.3.2 to 2.3.3.
<details>
<summary>Commits</summary>

- [`24f4d7d`](https://github.com/google/error-prone/commit/24f4d7d148446cc33467e30947ebcef15c84bebd) [maven-release-plugin] prepare release v2.3.3
- [`60e2caf`](https://github.com/google/error-prone/commit/60e2caff0e86c468fa3647a22f0e10fc2cb02012) Undo accidental version downgrade in cbe145af6e705512e6ac765e48860844ef8c00dd.
- [`c1f7363`](https://github.com/google/error-prone/commit/c1f73637bd274b9543366fdc1147991023a9af82) Fix some NPEs in preparation for the next release
- [`1f2fed9`](https://github.com/google/error-prone/commit/1f2fed928c87a548588278fe4333688e40b31ffe) Remove [@&#8203;BugPattern.category](https://github.com/BugPattern.category)
- [`530c14e`](https://github.com/google/error-prone/commit/530c14eff6a74c6ddcd9043e1adbd26fd5f79948) Open-source tests for annotated APIs in ApiDiffChecker.
- [`a115dc3`](https://github.com/google/error-prone/commit/a115dc38ba176ff98dab737d8fad9585be384122) Make UnusedVariable catch (some) unused assignments, e.g.:
- [`01d4242`](https://github.com/google/error-prone/commit/01d4242f653bd0de7bfe2b687aa5b7e95b97bad8) minor additions to java.io
- [`42911a2`](https://github.com/google/error-prone/commit/42911a257ef7f811855effede17a546eb253c809) Remove uses of [@&#8203;BugPattern.category](https://github.com/BugPattern.category)
- [`5b5684f`](https://github.com/google/error-prone/commit/5b5684f11f70aeb55bf88fd103362b204fb87585) Handle static methods in InfiniteRecursion
- [`cbe145a`](https://github.com/google/error-prone/commit/cbe145af6e705512e6ac765e48860844ef8c00dd) Remove a spurious ".".
- Additional commits viewable in [compare view](https://github.com/google/error-prone/compare/v2.3.2...v2.3.3)
</details>
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dropwizard/dropwizard-discovery