[TS] Make options optional (#101)

Make each Option property optional to allow passing in partial options objects (e.g. `{ pretty: true }`)

Author: andrewiggins

src/index.d.ts

@@ -2,13 +2,13 @@ import { VNode } from 'preact';
 
 declare module render {
   interface Options {
-    shallow:boolean;
-    xml:boolean;
-    pretty:boolean;
+    shallow?: boolean;
+    xml?: boolean;
+    pretty?: boolean;
   }
 
-  function render(vnode:VNode, context?:any, options?:Options):string;
-  function shallowRender(vnode:VNode, context?:any):string;
+  function render(vnode: VNode, context?: any, options?: Options): string;
+  function shallowRender(vnode: VNode, context?: any): string;
 }
 
 export = render;