Update typescript template to follow some conventions (#42)

* Update default project to follow conventions

src/wait.ts

@@ -1,10 +1,9 @@
-export function wait(milliseconds: number) {
-    return new Promise((resolve) => {
-        if (isNaN(milliseconds)) { 
-            throw new Error('milliseconds not a number'); 
-        }
+export async function wait(milliseconds: number): Promise<string> {
+  return new Promise(resolve => {
+    if (isNaN(milliseconds)) {
+      throw new Error('milliseconds not a number')
+    }
 
-        setTimeout(() => resolve("done!"), milliseconds)
-    });
+    setTimeout(() => resolve('done!'), milliseconds)
+  })
 }
-