log: don't enable this feature by default (#660)

Noah-Kennedy · web-flow · commit 5064987ffec4 · 2022-04-14T09:25:42.000+02:00
Unfortunately, tracing/log is a non-additive feature (tokio-rs/tracing#1793), so enabling it is a bit radioactive.
diff --git a/tower/Cargo.toml b/tower/Cargo.toml
@@ -23,7 +23,6 @@ edition = "2018"
 rust-version = "1.49.0"
 
 [features]
-default = ["log"]
 
 # Internal
 __common = ["futures-core", "pin-project-lite"]
