Bump version to 15.2.0:

Adds support for:
- donalskehan.com
- eatthismuch.com
- glutenfreeonashoestring.com
- miljuschka.nl
- theglutenfreeaustrian.com
- theloopywhisk.com

Bugfixes:
- Fix ingredient grouping retrieval for arla
- Remove workaround from kitchenstories
- Update/fix scraper for gesund+aktiv
- Update/fix scraper for realsimple
- Update/fix scraper for sallysblog
- Update/fix scraper for tofoo
- Update/fix scraper for wikicookbook

Misc:
- Drops support for Python 3.8 (EOL)
- Modernize some type hints given that Python 3.9 has become baseline
- Adds an enforced order for nutritional expectations in JSON test
  data
- Refactor the 'generate.py' scraper-generator script
- Raise a newly-added 'RecipeSchemaNotFound' exception when the
  schema.org-fill plugin fails to find metadata on the page
- Require only 'ingredients_list', not also 'ingredients', in the
  test JSON data.
- Cleanups: remove redundant methods and test expectation data

recipe_scrapers/__version__.py

@@ -1 +1 @@
-__version__ = "15.1.0"
+__version__ = "15.2.0"