deny: Advisories are denied by default, they are no longer configurable

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

deny.toml

@@ -31,13 +31,6 @@ targets = [
 db-path = "~/.cargo/advisory-db"
 # The url(s) of the advisory database to use
 db-urls = ["https://github.com/rustsec/advisory-db"]
-# The lint level for security vulnerabilities
-vulnerability = "warn"
-# The lint level for unmaintained crates
-unmaintained = "warn"
-# The lint level for crates with security notices. Note that as of
-# 2019-12-17 there are no security notice advisories in https://github.com/rustsec/advisory-db
-notice = "warn"
 # A list of advisory IDs to ignore. Note that ignored advisories will still output
 # a note when they are encountered.
 ignore = []