Cargo Features

chrono-tz-build has no features set by default.

[dependencies]
chrono-tz-build = { version = "0.2.1", features = ["filter-by-regex", "case-insensitive"] }
filter-by-regex = regex
case-insensitive = uncased

Enables uncased of phf

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

regex filter-by-regex?
uncased case-insensitive?