Update README.md

Author: javadev

README.md

@@ -19,7 +19,7 @@ Include the following in your `pom.xml` for Maven:
   <dependency>
     <groupId>com.github.javadev</groupId>
     <artifactId>leetcode-in-kotlin</artifactId>
-    <version>1.5</version>
+    <version>1.6</version>
   </dependency>
   ...
 </dependencies>
@@ -28,7 +28,7 @@ Include the following in your `pom.xml` for Maven:
 Gradle:
 
 ```groovy
-implementation 'com.github.javadev:leetcode-in-kotlin:1.5'
+implementation 'com.github.javadev:leetcode-in-kotlin:1.6'
 ```
 
 > ["For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."](https://www.quora.com/How-effective-is-Leetcode-for-preparing-for-technical-interviews)