Update README.md for v2.1.8 release

Author: 3520kramer

README.md

@@ -17,9 +17,9 @@ This whitepaper contains the needed information to perform a successful integrat
 Using Gradle:
 
 ```gradle
-implementation 'com.queue-it.androidsdk:library:2.1.4'
+implementation 'com.queue-it.androidsdk:library:2.1.8'
 //For AndroidX
-//implementation 'com.queue-it.androidsdk:library-androidx:2.1.4'
+//implementation 'com.queue-it.androidsdk:library-androidx:2.1.8'
 ```
 
 ## How to use the library (Mobile SDK integration only, no API protection)
@@ -157,4 +157,4 @@ If your application is using an API that's protected by a Queue-it connector (Kn
 
 ```xml
 <activity android:name="com.queue_it.androidsdk.QueueActivity" />
-```
+```