accucor 0.3.0

• Added reference to package description
• Properly recognize new El-Maven column “adductName” as a non-sample column (#26, @lparsons)
• Export lower level functions for isotope correction: carbon_isotope_correction, deuterium_isotope_correction, and nitrogen_isotope_correction (#29, @lparsons)

accucor 0.2.4

• First CRAN release