Release 0.2.1

• migrated to jacoco-filtering-extension 0.9.0
• simplified min coverage configuration with <minCoverage/>

   <minCoverage>0.7</minCoverage>
  
   <!-- configuration above is identical to configuration below -->
   <minLines>0.7</minLines>
   <minBranches>0.7</minBranches>
   <minInstructions>0.7</minInstructions>