Merge pull request #18 from medic911/master

Fix strToHex function for 0-9 char codes

src/str-to-hex.js

@@ -2,7 +2,7 @@
 module.exports = (str, options) => {
     let hex = "";
     for (let i = 0, l = str.length; i < l; i++) {
-        hex += str.charCodeAt(i).toString(16);
+        hex += str.charCodeAt(i).toString(16).padStart(2, '0');
     }
     if (options) {
         if (options.grouped) {