Bugfix/#171 annotations items provided as object instead of array

Bug fix

Summary

This MR considers the case where we have only one annotation item on a page. While this has been stored as object previously, it is now stored within an array and can be accessed properly by TIDO.

How to test:

• go to https://ahikar-test.sub.uni-goettingen.de/api/annotations/ahikar/arabic-karshuni/3r177/6a/annotationPage.json (VPN)
• check if the annotation item is part of an array

Compliance to “Definition of Done”

• Unit tests passed
• Code reviewed
• Product Owner accepts the User Story

Changelog

• I added a statement to the CHANGELOG.

Version number

• I bumped the version number in build.properties.

Readme and general docs

• I updated the README (if applicable) and kept the docs up to date.

Closes

Closes #171 (closed)

/cc Mathias Göbel, Frank Schneider, Michelle Weidling