[doc] Added travis status badge

README.md

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 # PSCF - Polymer Self-Consistent Field Theory
 
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 Copyright (2002-2016) Regents of the University of Minnesota
 
 PSCF is a Fortran 90 program for numerically solving the polymer
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 A library of examples is provided in a separate github repository,
 located at https://github.com/dmorse/pscf-examples
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+[buildstatus_image_travis]: https://travis-ci.org/Gjacquenot/pscf.svg?branch=master
+[travisci]: https://travis-ci.org/Gjacquenot/pscf