docs: add "ChromeHeadless" to list of possible browsers

See: karma-runner/karma-chrome-launcher#111 (comment).
karma-runner · Mar 3, 2018 · e7b9ab8 · e7b9ab8
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commit e7b9ab8
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diff --git a/docs/config/01-configuration-file.md b/docs/config/01-configuration-file.md
@@ -174,6 +174,7 @@ If, during test execution, Karma does not receive any message from a browser wit
 
   * `Chrome` (launcher requires karma-chrome-launcher plugin)
   * `ChromeCanary` (launcher requires karma-chrome-launcher plugin)
+  * `ChromeHeadless` (launcher requires karma-chrome-launcher plugin ^2.1.0)
   * `PhantomJS` (launcher requires karma-phantomjs-launcher plugin)
   * `Firefox` (launcher requires karma-firefox-launcher plugin)
   * `Opera` (launcher requires karma-opera-launcher plugin)