Update README.md

Kostersson · web-flow · commit 3906a64cc2ad · 2018-07-27T12:47:09.000+03:00
version number
diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ add following to composer
 ```json
     "require" : 
     {
-        "solinor/paymenthighwayio" : "1.5.0"
+        "solinor/paymenthighwayio" : "1.6.0"
     }
 ```
 
