chore: Don't warn on unsafe

This works well when a package is a safe abstraction but to universally
apply in a template to all members of a workspace doesn't make sense.

Author: epage

Cargo.toml

@@ -24,7 +24,6 @@ missing_docs = "warn"
 rust_2018_idioms = "warn"
 unreachable_pub = "warn"
 unsafe_op_in_unsafe_fn = "warn"
-unsafe_code = "warn"
 unused_lifetimes = "warn"
 unused_macro_rules = "warn"
 unused_qualifications = "warn"