Change utcOffset option to be a method

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "adx-query-charts",
-  "version": "1.1.13",
+  "version": "1.1.22",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "adx-query-charts",
-  "version": "1.1.21",
+  "version": "1.1.22",
   "description": "Draw charts from Azure Data Explorer queries",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -32,7 +32,7 @@
     "typescript": "^3.7.2",
     "@types/jest": "^24.0.22",
     "jest": "^24.9.0",
-    "@types/lodash": "^4.14.135",  
+    "@types/lodash": "^4.14.135",
     "@types/highcharts": "^7.0.0"
   },
   "dependencies": {