fix: move worker-loader to dependencies (#1467)

fixes #1459

package.json

@@ -103,7 +103,8 @@
     "text-encoding": "^0.7.0",
     "tiny-queue": "^0.2.1",
     "webpack": "^4.39.2",
-    "webpack-bundle-analyzer": "^3.4.1"
+    "webpack-bundle-analyzer": "^3.4.1",
+    "worker-loader": "^2.0.0"
   },
   "devDependencies": {
     "assert": "^2.0.0",
@@ -112,8 +113,7 @@
     "mocha": "^6.2.0",
     "now": "^16.2.0",
     "standard": "^14.0.2",
-    "testcafe": "^1.4.1",
-    "worker-loader": "^2.0.0"
+    "testcafe": "^1.4.1"
   },
   "engines": {
     "node": ">= 8"