Hide build status badges from Doxygen in root README.md

Author: jimmysoda

README.md

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 pdal-c: PDAL C API
 ==================
 
+[//]: # (@cond Hide build status from Doxygen)
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+[//]: # (@endcond)
 
 *pdal-c* is a C API for the Point Data Abstraction Library ([PDAL](http:/github.com/PDAL/PDAL))
 and is compatible with PDAL 1.7 and later.