bump version numbers to 4.3.0

This release contains both #113 (batch event submission)
and #104 (a dependency update).

Author: ePaul

nakadi-producer-spring-boot-starter/pom.xml

@@ -10,7 +10,7 @@
     <parent>
         <groupId>org.zalando</groupId>
         <artifactId>nakadi-producer-reactor</artifactId>
-        <version>4.2.0</version>
+        <version>4.3.0</version>
     </parent>
 
     <artifactId>nakadi-producer-spring-boot-starter</artifactId>

nakadi-producer/pom.xml

@@ -10,7 +10,7 @@
     <parent>
         <groupId>org.zalando</groupId>
         <artifactId>nakadi-producer-reactor</artifactId>
-        <version>4.2.0</version>
+        <version>4.3.0</version>
     </parent>
 
     <artifactId>nakadi-producer</artifactId>

pom.xml

@@ -15,7 +15,7 @@
 
     <artifactId>nakadi-producer-reactor</artifactId>
     <groupId>org.zalando</groupId>
-    <version>4.2.0</version>
+    <version>4.3.0</version>
     <packaging>pom</packaging>
     <name>Nakadi Event Producer Reactor</name>