fix(tsconfig) use react jsx

Author: 9renpoto

test/preact-render-to-string-tests.tsx

@@ -1,5 +1,5 @@
 import render from '../src';
-import { VNode } from 'preact';
+import { VNode, h } from 'preact';
 
 let vdom: VNode = <div class="foo">content</div>;
 

tsconfig.json

@@ -13,7 +13,7 @@
         "typeRoots": [
             "../"
         ],
-        "jsx": "preserve",
+        "jsx": "react",
         "jsxFactory": "h",
         "experimentalDecorators": true,
         "types": [],