Update tsconfig.json to autocomplete imports (wasp-lang#92)

app/tsconfig.json

@@ -5,6 +5,10 @@
 // compiler. Proper TS compiler configuration in Wasp is coming soon :)
 {
   "compilerOptions": {
+    "target": "esnext",
+    // We're bundling all code in the end so this is the most appropriate option,
+    // it's also important for autocomplete to work properly.
+    "moduleResolution": "bundler",
     // JSX support
     "jsx": "preserve",
     "strict": true,
@@ -33,4 +37,4 @@
     // https://stackoverflow.com/questions/42609768/typescript-error-cannot-write-file-because-it-would-overwrite-input-file
     "outDir": ".wasp/phantom"
   }
-}
+}