message: fix typo in end-to-end-test run script output
diff: @@ -12,7 +12,7 @@ fi
  has_custom_app=$(node has-custom-app.js $@)
  if [ ! -d "element/element-web" ] && [ $has_custom_app -ne "1" ]; then
  - echo "Please provide an instance of Element to test against by passing --element-url <url> or running $BASE_DIR/element/install.sh"
  + echo "Please provide an instance of Element to test against by passing --app-url <url> or running $BASE_DIR/element/install.sh"
  exit 1
  fi
  