Add Config struct for initialization

Breaking change, the constructor with port number is discarded and a Config struct can be passed instead with more options for controlling the modbus and socket options

v0.4.2

Bump version

Update dependencies

v0.4.1

Update dependencies

Better stability and error reporting

Also increasing the send and receive packet size as specified by the Modbus standard.

Handle errors more gracefully, avoid panics.

v0.3.3

Bump version numbers

Fix parallel doctests

Fix doctests

Adding the possibility to run the testserver on a specific port.
The doctests seem to run in parallel recently, so the spawned servers
need different ports.

Add commandline client application

0.3.1

Bump version

Scoped objects

0.3.0

Bump version and fix README

Client trait for more objectoriented API

0.2.0

Bump version number

First version with full read-write support for ModbusTCP as a Client

0.1.0

Fix test-server dependency in packages