Update tests/dep-time-travel.sh

Co-authored-by: Jordan Harband <[email protected]>

Author: ota-meshi

tests/dep-time-travel.sh

@@ -37,7 +37,7 @@ if [[ "$TRAVIS_NODE_VERSION" -lt "8" ]]; then
   npm i --no-save [email protected]
 fi
 
-if [[ "$ESLINT_VERSION" = "^8.0.0-0" ]]; then
+if [ "${ESLINT_VERSION}" = '^8.0.0-0' ]; then
   echo "Installing self"
   npm i --no-save eslint-plugin-import@'.' -f
   echo "Build self"