dev: Uses the proper import part so AssemblyScript types are properly…

… resolved inside graph-ts (#221)

Next step will be to fix the `graph-cli` so it generates the proper config for new project for a perfect resolution.

tsconfig.json

@@ -1,4 +1,4 @@
 {
-  "extends": "./node_modules/assemblyscript/tsconfig.assembly.json",
+  "extends": "assemblyscript/std/assembly",
   "include": ["index.ts"]
 }