Merge pull request #719 from opensheetmusicdisplay/greenkeeper/@types/chai-4.2.11

chore(package): update @types/chai to version 4.2.11

package.json

@@ -71,7 +71,7 @@
     "vexflow": "1.2.90"
   },
   "devDependencies": {
-    "@types/chai": "^4.2.10",
+    "@types/chai": "^4.2.11",
     "@types/mocha": "^7.0.2",
     "@types/node": "^13.11.0",
     "canvas": "^2.6.1",