Use genicam==1.0.1 if the Python was version 3.8

[kazunarikudo]

Describe the bug
It fails to install harvesters from Python 3.8 because due to the change made for #178; it enforces the installation process to install genicam==1.0.0 even though the package does not support Python 3.8.

To Reproduce
Steps to reproduce the behavior:

1. From Python 3.8, execute $ pip install harvesters.
2. Then you will see the following message.

ERROR: Could not find a version that satisfies the requirement genicam==1.0.0 (from harvesters) (from versions: 1.0.1)

Expected behavior
For Python 3.8, it should install genicam==1.0.1.

Desktop (please complete the following information):

• OS: Any
• Python: 3.8
• Harvester: 1.2.4

Additional context
None.

[kazunarikudo]

As a workaround, I have just uploaded a genicam package that claims it's 1.0.0 but the content itself is 1.0.1 to resolve the Python 3.8 specific installation error. I would like Python 3.4, 3.5, 3.6, and 3.7 users to keep using the familiar genicam=1.0.0 until the GenICam committee officially releases a package that supports Python 3.8.