2.6.0

• Add custom_units keyword argument to parse_ingredient that allow a dict of custom units to be provided to aid in identifying units. See the docs for more details.
• Mark amounts described as "generous" as APPROXIMATE=True e.g. 6 generous cups water.
• Add part of speech based weighting in the uSIF ranker for FDC ingredient matching to increase the weight for nouns and decrease for verbs.