Merge pull request #80 from bodiyang/master

update format

index.md

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 				<p><i>USA federal individual income and payroll tax microsimulation model</i></p>
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 <p align="justify">Beyond incubation, we are committed to helping users by convening the open source community in Washington, D.C. and educating policymakers, modelers, and the public about open source policy analysis.</p> 
 
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