line feed in decription of cards after update to deck 0.4.0-beta2

[cloud2018]

Describe the bug
After update to deck 0.4.0-beta2 the line feeds in the description of a card are lost

To Reproduce
Steps to reproduce the behavior:

1. Create a card in deck 0.3.1 and add a description with some lines (markup with no special code, just line feeds)
2. Update to deck 0.4.0-beta2
3. Open the card
4. All lines (edited in deck 0.3.1) are in one line in deck 0.4.0-beta2.

Expected behavior
Same layout of the description after update to deck 0.4.0-beta2

Screenshots

deck 0.3.1: card with in edit mode:

deck 0.3.1: card with in viewing mode:

0.4.0-beta2: card with in viewing mode:

Client details:
Ubuntu 18.04
Firefox 60.0.2

Server details:
Ubuntu 18.04
Nextcloud 13.0.4
deck 0.3.1 and update to
deck 0.4.0-beta2 downloaded and extracted from github.../releases/download/v0.4.0-beta2/deck.tar.gz

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[juliusknorr]

Fixed by #508