Merge pull request nervosnetwork#4246 from eval-exec/exec/count-code-…

…by-tokei

Drop `cargo-count` in `make stats`, replace it by `tokei`

Makefile

@@ -261,8 +261,11 @@ clean-node-files: ## Clean files generated by `ckb init`
 ##@ Helpers
 .PHONY: stats
 stats: ## Counting lines of code.
-	@cargo count --version || cargo +nightly-2022-03-22 install --git https://github.com/kbknapp/cargo-count
-	@cargo count --separator , --unsafe-statistics
+	@command -v tokei || cargo install tokei
+	@tokei
+	# count lines of unsafe code
+	# ===============================================================================
+	@rg --no-heading unsafe --count-matches | sed 's/:/\ /g' | column -t
 
 .PHONY: help
 help:  ## Display help message.