Update core library to v3.6.1

[willcohen]

Not sure if you all are waiting on anything else for 3.6.1, but the updated polyfill algorithm seems to be working well here:

PolyfillBenchmark using core v3.6.0:

Benchmark                                         Mode  Cnt    Score   Error  Units
PolyfillBenchmark.benchmarkPolyfill              thrpt   20  645.709 ± 5.664  ops/s
PolyfillBenchmark.benchmarkPolyfillWithHole      thrpt   20  645.329 ± 2.836  ops/s
PolyfillBenchmark.benchmarkPolyfillWithTwoHoles  thrpt   20  640.004 ± 2.311  ops/s

PolyfillBenchmark using core v.3.6.1:

Benchmark                                         Mode  Cnt    Score   Error  Units
PolyfillBenchmark.benchmarkPolyfill              thrpt   20  735.690 ± 1.908  ops/s
PolyfillBenchmark.benchmarkPolyfillWithHole      thrpt   20  684.496 ± 2.169  ops/s
PolyfillBenchmark.benchmarkPolyfillWithTwoHoles  thrpt   20  641.440 ± 1.687  ops/s

[dfellis]

Not waiting on anything, the usual maintainer is on a break right now and it slipped our minds (and I think @nrabinowitz is the only one with commit access here not on break?)

[coveralls]

Pull Request Test Coverage Report for Build 188

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.49%

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Totals
Change from base Build 183:	0.0%
Covered Lines:	390
Relevant Lines:	392

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💛 - Coveralls

[nrabinowitz]

Thanks for submitting! The change looks good and I'm happy to merge, but I'll need to bring in @boyxgc to actually publish the library.

[willcohen]

Thanks for all of your work on h3!