add d3-dsv library dependency for parsing csv data (#43)

Author: RandomFractals

package-lock.json

@@ -77,6 +77,7 @@
     "test": "node ./out/test/runTest.js"
   },
   "devDependencies": {
+    "@types/d3-dsv": "^3.0.0",
     "@types/glob": "^7.1.4",
     "@types/mocha": "^9.0.0",
     "@types/node": "^14.5.0",
@@ -100,6 +101,7 @@
     "webpack-cli": "^4.7.2"
   },
   "dependencies": {
+    "d3-dsv": "^3.0.1",
     "htl": "^0.3.0",
     "leaflet": "^1.7.1",
     "leaflet.markercluster": "1.5.0"