In-App Range inconsistencies

[michalRajcan]

Describe the bug
Some apps contain only one value in In-App Purchase section (e.g. com.codium.bmicalculator).
Current functionality does not correctly parse (and store) the iap_range tuple while requesting app details.

At the same time, if Interactive Elements contains element with dash ("-") in name, iap_range returns the Interactive Elements list as well.

To Reproduce
incorrectly shown iap_range tuple: play_scraper.details('com.codium.bmicalculator')
or any other app with single In-App Purchase

Interactive Elemnts list in iap_range: play_scraper.details('com.LightBeam.Demolish')

Expected behavior
Function should return tuple containing the single In-App Purchase value in both places.

Desktop (please complete the following information):

• OS: macOS (does not matter though, happens also on another OSs)
• Python Version 3.7.7
• play_scraper Version 0.6.0

Note
I have fix ready, need approval for my branch and Pull Request