qg-cli: Set clippy warning level

This sets the default clippy level to pedantic in `qg-cli` for tools
such as IDEs. This is already set in `qg` and presubmit.

Change-Id: If19fd380773c6171539c3ea375d1536ac09b4a99
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/qg/+/124670
Pigweed-Auto-Submit: Alexei Frolov <frolv@google.com>
Reviewed-by: Erik Gilling <konkers@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/qg-cli/src/main.rs b/qg-cli/src/main.rs
index 7824800..67a82a0 100644
--- a/qg-cli/src/main.rs
+++ b/qg-cli/src/main.rs
@@ -14,6 +14,7 @@
 
 // Allows presubmit to fail on warnings.
 #![cfg_attr(feature = "strict", deny(warnings))]
+#![warn(clippy::pedantic)]
 
 mod hello;
 mod packages;