Upgrade to chart.js 2.9.3.

Author: typpo

package.json

@@ -17,7 +17,7 @@
     "test:watch": "PORT=2998 NODE_ENV=test chokidar '**/*.js' --initial --ignore node_modules -c 'mocha --exit --recursive test/'"
   },
   "dependencies": {
-    "chart.js": "^2.7.3",
+    "chart.js": "^2.9.3",
     "chartjs-chart-radial-gauge": "^1.0.3",
     "chartjs-node-canvas": "https://github.com/typpo/ChartjsNodeCanvas.git#c34802fc3c30e4d1992678134d3ee10d160f65f4",
     "chartjs-plugin-annotation": "^0.5.7",

yarn.lock

@@ -638,9 +638,10 @@ chart.js@^2.4.0:
     chartjs-color "^2.1.0"
     moment "^2.10.2"
 
-chart.js@^2.7.3:
-  version "2.7.3"
-  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-2.7.3.tgz#cdb61618830bf216dc887e2f7b1b3c228b73c57e"
+chart.js@^2.9.3:
+  version "2.9.3"
+  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-2.9.3.tgz#ae3884114dafd381bc600f5b35a189138aac1ef7"
+  integrity sha512-+2jlOobSk52c1VU6fzkh3UwqHMdSlgH1xFv9FKMqHiNCpXsGPQa/+81AFa+i3jZ253Mq9aAycPwDjnn1XbRNNw==
   dependencies:
     chartjs-color "^2.1.0"
     moment "^2.10.2"