Bump chart.js from 2.9.3 to 2.9.4

Bumps [chart.js](https://github.com/chartjs/Chart.js) from 2.9.3 to 2.9.4.
- [Release notes](https://github.com/chartjs/Chart.js/releases)
- [Commits](chartjs/Chart.js@v2.9.3...v2.9.4)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -26,7 +26,7 @@
     "autobahn": "^17.5.1",
     "binance-api-node": "^0.8.18",
     "ccxt": "^1.58.70",
-    "chart.js": "^2.7.1",
+    "chart.js": "^2.9.4",
     "cheerio": "^0.22.0",
     "currencies-exchange-rates": "^1.0.2",
     "d3-dsv": "^1.0.10",