remove unnesessary comments

contributing.md

@@ -5,7 +5,6 @@ Testing Locally:
 ```shell
 asdf plugin test <plugin-name> <plugin-url> [--asdf-tool-version <version>] [--asdf-plugin-gitref <git-ref>] [test-command*]
 
-# TODO: adapt this
 asdf plugin test circleci-cli https://github.com/ucpr/asdf-circleci-cli.git "circleci --help"
 ```
 

lib/utils.bash

@@ -30,8 +30,6 @@ list_github_tags() {
 }
 
 list_all_versions() {
-	# TODO: Adapt this. By default we simply list the tag names from GitHub releases.
-	# Change this function if circleci-cli has other means of determining installable versions.
 	list_github_tags
 }
 
@@ -82,7 +80,6 @@ install_version() {
 		mkdir -p "$install_path"
 		cp -r "$ASDF_DOWNLOAD_PATH"/* "$install_path"
 
-		# TODO: Assert circleci-cli executable exists.
 		local tool_cmd
 		tool_cmd="$(echo "$TOOL_TEST" | cut -d' ' -f1)"
 		test -x "$install_path/$tool_cmd" || fail "Expected $install_path/$tool_cmd to be executable."