SquareBracketColumnizer, double brackets

Logs like this dont show correctly:
```
[WARN ][18/08-06:06:18.436][ProgramName/MethodName[41]] About to run.
[WARN ][18/08-06:07:15.436][ProgramName/MethodName[771]] Finishing Application.
```

The "[ProgramName/MethodName[41]]" expression opens another squarebracket before closing the last one.
The number inside squarebrackets is the line number.