v1.7: removed the COD amount rounding

Different currencies have different rules regarding Cash on Delivery. GLS can only collect a certain fraction of HUF in cash. That makes cash collection difficult in other currencies, e.g. Romanian RON or European EUR.
Thus, the rounding should be handled by the client and not the library for now.

v1.5

updated composer packages + reqs & updated version endpoints

v1.4.1: Merge pull request #1 from themreza/fix_typo

Fixed typos

v1.4

added currency code for COD

added syslog logging

v1.2.1

added write logs to syslog

v1.2

fixed retrieval of parcel status