Update global parent and add spring-log4j2 dependency.

pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>eu.dnetlib</groupId>
         <artifactId>uoa-global-parent</artifactId>
-        <version>2.0.0</version>
+        <version>2.0.1</version>
     </parent>
     <artifactId>uoa-spring-boot-parent</artifactId>
     <version>2.0.1-SNAPSHOT</version>
@@ -50,6 +50,10 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-log4j2</artifactId>
+        </dependency>
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>