Split error into multiple lines

lib/read-metadata.js

@@ -151,7 +151,9 @@ async function readMetaData(path, {
     // file, then fail hard and let the user know that they need to pick one or the
     // other
     if (hasNowJson) {
-      const e = new Error('You have a `now` configuration field inside `package.json`, but configuration is also present in `now.json`! Please ensure there\'s a single source of configuration by removing one')
+      const e = new Error('You have a `now` configuration field' +
+      'inside `package.json`, but configuration is also present' +
+      'in `now.json`! Please ensure there\'s a single source of configuration by removing one')
       e.userError = true
       throw e
     } else {