Updated tsconfig.json：modify the compilation target from es5 to es6

Created by: puxiao

I ran into a problem yesterday, as follows:

type XxxType = 'aaa' | 'bbb' | 'ccc'
interface Xxx {
    type: XxxType
}
interface MyXxx {
    name: string
    xxx: Xxx
}
interface MyObj {
    arr: Iterable<MyXxx>
}

const myObj: MyObj = {
    arr: [ { name: 'aaa', xxx: { type: 'aaa' } } ]
}

emm...

Type '{ name: string; xxx: { type: string; }; }[]' is not assignable to type 'Iterable<MyXxx>'.
...
Type 'string' is not assignable to type 'XxxType'. ts[2322]

It's maddening and unbelievable.

I think there is nothing wrong with what I wrote.

Finally, I found the reason.

{
  "compilerOptions": {
-    "target": "es5",
+    "target": "es6",
    ...
  }
}

ES6 also called ES2015

ES5 seems like a very long time ago. So I suggest changing the default ES5 to ES6.