bring indentation in line with other front-end projects

.editorconfig

@@ -0,0 +1,23 @@
+#   Copyright 2017 Aviral Dasgupta
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+root = true
+
+[*]
+charset=utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true

start.js

@@ -29,7 +29,7 @@ async function runTests() {
     console.log("running tests ...");
     const options = {};
     if (debug) {
-    // options.slowMo = 10;
+        options.slowMo = 20;
         options.headless = false;
     }
     if (process.env.CHROME_PATH) {