0.1.5-more holding endings!

This update includes the possibility to select why your holding session ended, for now there are three options:

1. 🚽 I went to the bathroom

2. 🌊 I wet myself

3. 🧪 I measured my pee

The last cause (I measured my pee) also allows you to specify how much pee you measured, this will be useful in the future to better predict how much water is in your bladder during your holdings.

As always, please feel free to share your thoughts and ideas, I really appreciate them!