docs: fix info about "compareOpts"

doc/config.md

@@ -15,7 +15,10 @@ calibrate: false
 tolerance: 3.5
 antialiasingTolerance: 0,
 compareOpts:
-  stopOnFirstFail: true
+  stopOnFirstFail: false
+buildDiffOpts:
+  ignoreAntialiasing: true
+  ignoreCaret: true
 httpTimeout: 5000
 sessionRequestTimeout: 60000
 sessionQuitTimeout: 5000
@@ -215,9 +218,12 @@ Settings list:
 
 * `antialiasingTolerance` — read about this option in [looks-same](https://github.com/gemini-testing/looks-same#comparing-images-with-ignoring-antialiasing).
 
-* `compareOpts` — extra options for images comparing. It's an Object with following fields:
-    * `[stopOnFirstFail] {Boolean}` Only first pixel will be found if this option is true
-  See [looks-same](https://github.com/gemini-testing/looks-same#comparing-images) documentation for the list of options.
+* `compareOpts` — extra options for comparing images. See [looks-same](https://github.com/gemini-testing/looks-same#comparing-images) documentation for the list of available options. Default values are:
+```javascript
+compareOpts: {
+    stopOnFirstFail: false
+}
+```
 
 * `windowSize` — specify browser window dimensions (i.e. `1600x1200`). If not
   specified, the size of the window depends on WebDriver. :warning: You can't set specific resolutions for browser Opera or mobile platforms. They use only full-screen resolution.