[NEMO-447] Fix beam pom.xml to resolve build failure (#294)

JIRA: [NEMO-447: Fix beam pom.xml to resolve build failure](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-447)

**Major Changes:**

**Minor changes to note:**
* changed examples/beam/pom.xml to resolve build failure

**Tests for the changes:**

**Other comments:**

Closes #294
diff --git a/examples/beam/pom.xml b/examples/beam/pom.xml
index 75b9785..4cca999 100644
--- a/examples/beam/pom.xml
+++ b/examples/beam/pom.xml
@@ -103,6 +103,16 @@
               <goal>shade</goal>
             </goals>
             <configuration>
+              <filters>
+                <filter>
+                  <artifact>*:*</artifact>
+                  <excludes>
+                    <exclude>META-INF/*.SF</exclude>
+                    <exclude>META-INF/*.DSA</exclude>
+                    <exclude>META-INF/*.RSA</exclude>
+                  </excludes>
+                </filter>
+              </filters>
               <outputFile>
                 ${project.build.directory}/${project.artifactId}-${project.version}-shaded.jar
               </outputFile>