Ignore RUSTSEC-2020-0159 (#771)

Author: khyperia

deny.toml

@@ -6,7 +6,12 @@ vulnerability = "deny"
 unmaintained = "warn"
 yanked = "warn"
 notice = "warn"
-ignore = []
+ignore = [
+    # Potential Unix segfault if setting env vars in threaded context. The only use of the chrono crate is within
+    # ash-molten's build script, so can safely ignore.
+    # https://github.com/chronotope/chrono/issues/499
+    "RUSTSEC-2020-0159",
+]
 
 # This section is considered when running `cargo deny check bans`.
 # More documentation about the 'bans' section can be found here: