Scrape-schema-recipe

* Replaced format() with f-string
* removed support for Python 3.5

add graph support
update examples in test-data
update tests

* Expand python_objects to take a list or tuple to selectively convert some attribute types (PR 10)
* Drop support for Python 3.4

Bug Fixes:
* Fix User-Agent for requests (5)

New Features:
* Add pathlib support for load()
* Add example_output() for prototyping/debugging

other general code fixes that don't really impact the API ;-)

fix issue 2, move ingredients to recipeIngredient in recipe, thus "migrating the schema

Bug fixes:
* fix issue 1 allowing url for schema.org to use https
* add code for microdata that that translates 'type' to JSON-LD style 'type'