- Refactorise the tests and add some
- Use 250 signs instead of the whole text
- Only check for Korean, Chinese and Japanese script
- Add a benchmark
- Use a more idiomatic control flow
```console
$ # main branch
$ go test -bench=.
goos: linux
goarch: amd64
pkg: miniflux.app/v2/internal/reader/readingtime
BenchmarkEstimateReadingTime-12 267 4821268 ns/op
PASS
ok miniflux.app/v2/internal/reader/readingtime 1.754s
$ # speed_up_reading_time branch
$ go test -bench=.
goos: linux
goarch: amd64
pkg: miniflux.app/v2/internal/reader/readingtime
cpu: 12th Gen Intel(R) Core(TM) i7-1265U
BenchmarkEstimateReadingTime-12 1941 653312 ns/op
PASS
ok miniflux.app/v2/internal/reader/readingtime 1.342s
$
```