Temporarily use webpack5 branch.

Author: na9da

package.json

@@ -79,7 +79,7 @@
     "semver": "^5.0.0",
     "style-loader": "^4.0.0",
     "svg-sprite-loader": "^6.0.11",
-    "terriajs": "8.7.11",
+    "terriajs": "terriajs/terriajs#webpack5",
     "terriajs-cesium": "8.0.2",
     "terriajs-plugin-api": "0.0.1-alpha.16",
     "terriajs-plugin-sample": "0.0.1-alpha.7",