add travis status image

Author: krvajal

README.md

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 # Modern Fortran language support for VSCode
 
+[![Build Status](https://travis-ci.org/krvajal/vscode-fortran-support.svg?branch=master)](https://travis-ci.org/krvajal/vscode-fortran-support)
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 This extension provides support for the Fortran programming language. It includes syntax highlighting, code snippets and a linting based on gfortran.
 
 ## Features