Bump oj from 3.4.0 to 3.5.1

[dependabot-preview[bot]]

Bumps oj from 3.4.0 to 3.5.1.

Changelog

*Sourced from oj's [changelog](https://github.com/ohler55/oj/blob/master/CHANGELOG.md).* > ## 3.5.1 - 2018-04-14 > > - Fixed issue with \u0000 terminating keys early. > > - Add trace for calls to `to_json` and 'as_json`. > > ## 3.5.0 - 2018-03-04 > > - A trace option is now available in all modes. The format roughly follows the Ruby trace format.

Commits

- [`d5d4e31`](https://github.com/ohler55/oj/commit/d5d4e31c55b38f517e03a4549269edbba906597c) no memset with zero length - [`fe10a28`](https://github.com/ohler55/oj/commit/fe10a28f9d452909198a1eec7c7114dc70750a4f) Add trace for calls to to_json and as_json - [`2f5d75f`](https://github.com/ohler55/oj/commit/2f5d75f54cd11f85ce4bbdc39fb9ed9da515cf8c) Fix zero char short string issue - [`d6db134`](https://github.com/ohler55/oj/commit/d6db134573e0e22656aa4c965155d055f273937d) Rails dump trace - [`5849eea`](https://github.com/ohler55/oj/commit/5849eea4b62f6234526b336127bd215a773a1e85) Trace load - [`31fc46c`](https://github.com/ohler55/oj/commit/31fc46c253224f3fb10473c8db6742fdb9251929) Trace dump implemented - [`357cf57`](https://github.com/ohler55/oj/commit/357cf575e9c47204f6fc9ff174355185559c5981) Merge pull request [#460](https://github-redirect.dependabot.com/ohler55/oj/issues/460) from bf4/update_trace_point_reference - [`4ce2890`](https://github.com/ohler55/oj/commit/4ce28902d25aedfc5b8a280aaf404d58ac7cd1e9) Update Rails docs to describe TracePoint usage - [`6ada554`](https://github.com/ohler55/oj/commit/6ada5549f71a4ebe8248325632f07cdcb2b7a385) Fix some typos - [`3e63223`](https://github.com/ohler55/oj/commit/3e63223aebfbb74fe64ae90afaed28ad8bcd6a09) Merge pull request [#458](https://github-redirect.dependabot.com/ohler55/oj/issues/458) from olleolleolle/patch-1 - Additional commits viewable in [compare view](https://github.com/ohler55/oj/compare/v3.4.0...v3.5.1)

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Superseded by #1208.