Use loadtest4j 0.15.0

Author: Christopher Kilding

README.md

@@ -14,7 +14,6 @@ Wrk driver for loadtest4j.
     <dependency>
         <groupId>org.loadtest4j.drivers</groupId>
         <artifactId>loadtest4j-wrk</artifactId>
-        <version>[version]</version>
         <scope>test</scope>
     </dependency>   
     ```

pom.xml

@@ -41,7 +41,7 @@
         <dependency>
             <groupId>org.loadtest4j</groupId>
             <artifactId>loadtest4j</artifactId>
-            <version>0.14.3</version>
+            <version>0.15.0</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>