Fixing uppercase in hashing

Author: DarkGL

package.json

@@ -1,7 +1,7 @@
 {
   "name": "simpay-typescript-api",
   "author": "Rafał Więcek",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "description": "SimPay.pl API",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",

src/lib/hashing.ts

@@ -18,6 +18,6 @@ export class Hashing {
 
         hash.update(text);
 
-        return hash.digest('hex').toUpperCase();
+        return hash.digest('hex');
     }
 }