Issue #432: upgrade checkstyle to 10.3.4

Author: muhlba91

README.md

@@ -21,6 +21,7 @@ Compatibility matrix from checkstyle team:
 
 | Checkstyle Plugin | Sonar min | Sonar max | Checkstyle | Jdk |
 |-------------------|-----------|-----------|------------|-----|
+| 10.3.4            | 9.0       | 9.0+      | 10.3.4     | 11  |
 | 10.3.3            | 9.0       | 9.0+      | 10.3.3     | 11  |
 | 10.3.2            | 9.0       | 9.0+      | 10.3.2     | 11  |
 | 10.3.1            | 9.0       | 9.0+      | 10.3.1     | 11  |

pom.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>com.github.checkstyle</groupId>
@@ -93,7 +94,7 @@
   </ciManagement>
 
   <properties>
-    <checkstyle.version>10.3.3</checkstyle.version>
+    <checkstyle.version>10.3.4</checkstyle.version>
     <sonar.version>8.9.0.43852</sonar.version>
     <sonar-java.version>7.2.0.26923</sonar-java.version>
     <maven.sevntu.checkstyle.plugin.version>1.42.0</maven.sevntu.checkstyle.plugin.version>