new version 3.2.3

Corrected missing `data` variable

Allow returning `null` from constProvider, keep `undefined` for fallback

update version to 3.2.2

Normalized casing of const/function access (#28)

update version to 3.2.1

Merge pull request #27 from danielgindi/security/disable_root_by_default

Merge pull request #26 from danielgindi/bugfix/minus_shift_after_factorial

Disable root access by default (Closes #17)

Fixes the minus sign shift after a factorial (Closes #23)

Merge pull request #25 from danielgindi/bugfix/expr

[fix] correctly define expression source for enclosed negative virtual token

update npmignore with more folders to ignore

update version to 3.2.0

Merge pull request #22 from danielgindi/structured_errors