Change log4j2 version in sample pom and in Readme from 2.7 to 2.8.2

Change-Id: I470feada79eb9f02206bf71f4f05958c2ff32bf2

Author: ChristophEichhorn

README.md

@@ -84,12 +84,12 @@ Again, we don't include dependencies to those implementation backends ourselves,
 <dependency>
 	<groupId>org.apache.logging.log4j</groupId>
 	<artifactId>log4j-slf4j-impl</artifactId>
-<version>2.7</version>
+	<version>2.8.2</version>
 </dependency>
 	<dependency>
 	<groupId>org.apache.logging.log4j</groupId>
 	<artifactId>log4j-core</artifactId>
-	<version>2.7</version>
+	<version>2.8.2</version>
 </dependency>
 ```
 

sample/pom.xml

@@ -12,7 +12,7 @@
 
     <properties>
         <tomcat.version>8.0.39</tomcat.version>
-        <log4j2.version>2.7</log4j2.version>
+        <log4j2.version>2.8.2</log4j2.version>
         <logback.version>1.1.3</logback.version>
         <jackson.version>2.5.4</jackson.version>
         <slf4j.version>1.7.12</slf4j.version>