<assembly>
  <id>sources</id>
  <formats>
    <format>zip</format>
  </formats>
  <fileSets>
    <fileSet>
      <includes>
       <include>README.md</include>
       <include>LICENSE.txt</include>
       <include>NOTICE.txt</include>
       <include>BUILDING.txt</include>
       <include>pom.xml</include>
       <include>build.xml</include>
       <include>checkstyle.xml</include>
       <include>spotbugs-exclude-filter.xml</include>
       <include>license-header.txt</include>
      </includes>
      <useDefaultExcludes>true</useDefaultExcludes>
    </fileSet>
    <fileSet>
      <directory>src</directory>
      <useDefaultExcludes>true</useDefaultExcludes>
    </fileSet>
  </fileSets>
</assembly>

<assembly>
  <id>sources</id>
  <formats>
    <format>zip</format>
  </formats>
  <fileSets>
    <fileSet>
      <includes>
       <include>README.md</include>
       <include>LICENSE.txt</include>
       <include>NOTICE.txt</include>
       <include>BUILDING.txt</include>
       <include>CONTRIBUTING.md</include>
       <include>pom.xml</include>
       <include>build.xml</include>
       <include>checkstyle.xml</include>
       <include>spotbugs-exclude-filter.xml</include>
       <include>license-header.txt</include>
      </includes>
      <useDefaultExcludes>true</useDefaultExcludes>
    </fileSet>
    <fileSet>
      <directory>src</directory>
      <useDefaultExcludes>true</useDefaultExcludes>
    </fileSet>
  </fileSets>
</assembly>

Add CONTRIBUTING.md to source distribution archive
Add CONTRIBUTING.md to source distribution archive
