bug #197 Chartjs 3 docs tweaks (weaverryan)

This PR was merged into the 2.x branch.

Discussion
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Chartjs 3 docs tweaks

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tickets       | none
| License       | MIT

Changes in Chart.js v3 - I got these when testing the docs just now :).

Cheers!

Commits
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73cb18d tweaking Chart.js README for changes in chart.js v3

Author: weaverryan

src/Chartjs/README.md

@@ -52,8 +52,9 @@ class HomeController extends AbstractController
 
         $chart->setOptions([
             'scales' => [
-                'yAxes' => [
-                    ['ticks' => ['min' => 0, 'max' => 100]],
+                'y' => [
+                   'suggestedMin' => 0,
+                   'suggestedMax' => 100,
                 ],
             ],
         ]);