Point to the new SDK in README

Maciej Tarnowski · Maciej Tarnowski · commit 92d0ba8496fc · 2019-06-07T08:20:19.000+02:00
diff --git a/README.md b/README.md
@@ -1 +1 @@
-### This project is abandoned, soon new version will be available.
+### This project is abandoned, please use [getresponse/sdk-php](https://github.com/GetResponse/sdk-php)

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-### This project is abandoned, soon new version will be available.`
	`1`	`+### This project is abandoned, please use [getresponse/sdk-php](https://github.com/GetResponse/sdk-php)`