Sentence case bench
Sentence case bench

RESULTS:

```
test cases::sentencecase::tests::bench_is_sentence                                ... bench:       2,620 ns/iter (+/- 1,255)
test cases::sentencecase::tests::bench_sentence                                   ... bench:       2,569 ns/iter (+/- 1,360)
test cases::sentencecase::tests::bench_sentence_from_snake                        ... bench:       2,066 ns/iter (+/- 1,077)
```

whatisinternet/Inflector