conflicting tensorflow requirements make installing imagededup fail

[mwaitzman]

snip of CMD output:

ERROR: Cannot install -r requirements.txt (line 1) because these package versions have conflicting dependencies.

The conflict is caused by:
    imagededup 0.1.0 depends on tensorflow==2.0.0
    imagededup 0.0.4 depends on tensorflow==2.0.0
    imagededup 0.0.3 depends on tensorflow==1.13.1
    imagededup 0.0.2 depends on tensorflow==1.13.1
    imagededup 0.0.1 depends on tensorflow==1.13.1
    ```