Update compiled assets

Author: yamadapc

bower.json

@@ -3,7 +3,7 @@
   "description": "Convert numbers to words - their written form",
   "homepage": "https://yamadapc.github.io/js-written-number",
   "main": "./dist/written-number.js",
-  "version": "0.8.0",
+  "version": "0.8.1",
   "keywords": [
     "numbers",
     "words",

dist/written-number.js

@@ -1049,6 +1049,10 @@ function writtenNumber(n, options) {
   options = options || {};
   options = util.defaults(options, writtenNumber.defaults);
 
+  if (n < 0) {
+    return "";
+  }
+
   n = Math.round(+n);
 
   var language = typeof options.lang === "string"