pub const KEY_VARIABLE: &str = "AEDE_ACOUSTID_KEY";Expand description
The environment variable holding the application key.
AcoustID requires one and Aède ships none, for a reason worth stating:
a key baked into an open-source binary is a key every copy of the program
shares, and the quota with it. Registering takes a minute and the key is
free — no_key says where.