Update scripts

tools/publish.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 set -euo pipefail
 IFS=$'\n\t'
+cd "$(dirname "$0")"/..
 
 # Publish a new release.
 #
@@ -10,8 +11,6 @@ IFS=$'\n\t'
 # NOTE:
 # - This script requires parse-changelog <https://github.com/taiki-e/parse-changelog>
 
-cd "$(cd "$(dirname "$0")" && pwd)"/..
-
 bail() {
     echo >&2 "error: $*"
     exit 1

tools/tidy.sh

@@ -2,6 +2,7 @@
 # shellcheck disable=SC2046
 set -euo pipefail
 IFS=$'\n\t'
+cd "$(dirname "$0")"/..
 
 # USAGE:
 #    ./tools/tidy.sh
@@ -11,8 +12,6 @@ IFS=$'\n\t'
 # - prettier
 # - shellcheck
 
-cd "$(cd "$(dirname "$0")" && pwd)"/..
-
 x() {
     local cmd="$1"
     shift