SwiftLint2

Optimize `excludingPattern` in `violatingOpeningBraceRanges()`

Fix #491
By applying this, on linting KeychainAccess:
from(0.8.0):
```
swiftlint lint --config ~/.swiftlint-test.yml  29.61s user 0.18s system 98% cpu 30.175 total
```
to:
```
swiftlint lint --config ~/.swiftlint-test.yml  1.92s user 0.06s system 91% cpu 2.160 total
```