Add missing log-trace feature

This fixes a new compiler warning for unexpected cfgs.

Author: robin-nitrokey

Cargo.toml

@@ -41,6 +41,7 @@ raw = ["rsa/hazmat"]
 
 log-all = []
 log-none = []
+log-trace = []
 log-info = []
 log-debug = []
 log-warn = []