Fix style setProperty (#13)

Author: kuzmadom

src/entries/dom-api.js

@@ -1,3 +1,8 @@
 import {document as lightJsDocument} from '@litejs/dom';
+import {CSSStyleDeclaration} from '@litejs/dom/css';
+
+CSSStyleDeclaration.prototype.setProperty = function(key, value) {
+	this[key] = value;
+};
 
 export const document = lightJsDocument;