Changes
=======

0.3.20
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- add eGFR and eGFR drop to DAIDS tox list where
  eGFR "0.0<=x<45.0" and eGFR drop >40% drop from
  baseline.
- fix egfr_percent_change to return percentage (*100)

0.3.6
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- change field name creatinine to creatinine_value

0.3.5
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- add normal ranges
- separate utest-id and field name
- rename to reference_range_collection

0.1.34
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- add `fasting` as a default field for normal and grading references
