fix: install @as/loader

Author: aminya

package-lock.json

@@ -47,6 +47,7 @@
     "@babel/plugin-proposal-object-rest-spread": "^7.5.5",
     "@babel/plugin-transform-react-jsx": "^7.3.0",
     "assemblyscript": "^0.10.0",
+    "@assemblyscript/loader": "latest",
     "babel-preset-es2015-rollup": "^3.0.0",
     "chokidar-cli": "^2.0.0",
     "cpy-cli": "^2.0.0",