Bugfixes and code improvements

Most of the stuff is related to the MT940 parsing

MT940 parsing fixes

v1.0.3

Updated version in composer

Fixed cases where booking date can be empty in SWIFT

v1.0.2

Merge branch 'master' of https://github.com/mschindler83/fints-hbci-php

Bugfix for booking date and making Monolog optional

Booking date fix in MT940 parsing

This release includes a fix for the MT940 booking date parsing.
:61:1608010802C[...]

The booking date (bold) is optional. So we have to handle this.

Monolog now optional

I don't want to force anyone to use Monolog for logging. So the monolog package is now optional.
fints-hbci-php just needs a PSR conform logger interface to work.

Initial stable release

Initial release of version 1.0.0