upgrade maven plugins

Signed-off-by: Sergei Malafeev <sergeymalafeev@gmail.com>

pom.xml

@@ -64,7 +64,7 @@
     <akka.version>2.5.23</akka.version>
     <opentracing.version>0.32.0</opentracing.version>
     <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
-    <jacoco-maven-plugin.version>0.8.3</jacoco-maven-plugin.version>
+    <jacoco-maven-plugin.version>0.8.4</jacoco-maven-plugin.version>
   </properties>
 
   <dependencies>
@@ -266,7 +266,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-source-plugin</artifactId>
-            <version>3.0.1</version>
+            <version>3.1.0</version>
             <executions>
               <execution>
                 <id>attach-sources</id>
@@ -280,7 +280,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-javadoc-plugin</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1</version>
             <configuration>
               <failOnError>false</failOnError>
             </configuration>