Dont package tests (#34)

Exclude tests from wheel distribution

Author: iconnor

setup.py

@@ -13,7 +13,7 @@
     long_description=long_description,
     long_description_content_type="text/markdown",
     url="https://github.com/tjhowse/modbus4mqtt",
-    packages=setuptools.find_packages(),
+    packages=setuptools.find_packages(exclude=['tests']),
     install_requires=[
         'ruamel.yaml>=0.16.12',
         'paho-mqtt>=1.5.0',