update readme, remove unused pom variable

Author: AugustNagro

README.md

@@ -54,7 +54,7 @@ CompletionStage<byte[]> userPdf = userIdsFromDb().thenCompose(userIds -> {
 <dependency>
   <groupId>com.augustnagro</groupId>
   <artifactId>java-async-await</artifactId>
-  <version>0.2.0</version>
+  <version>0.2.1</version>
 </dependency>
 ```
 

pom.xml

@@ -15,8 +15,6 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-
-    <vertx.version>4.3.5</vertx.version>
   </properties>
 
   <developers>