Fixed window check for use server side

Author: James Hill

package.json

@@ -1,6 +1,6 @@
 {
    "name": "hypnode",
-   "version": "1.1.2",
+   "version": "1.1.3",
    "description": "",
    "main": "dist/index.js",
    "types": "dist/index.d.ts",

src/index.ts

@@ -33,7 +33,7 @@ type Tag = string | ((attrs?: IAttrs) => HTMLElement);
  * -------------------------------- */
 
 function h(tag: Tag, attrs?: IAttrs, ...children: any[]): HTMLElement {
-   const { document } = window || {};
+   const { document = null } = typeof window !== 'undefined' ? window : {};
 
    children = [].concat.apply([], children);