Update README.md (travis removal)

Author: Azzaare

README.md

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 # CompressedStacks.cpp
-[![Build Status](https://travis-ci.org/Azzaare/CompressedStacks.cpp.svg?branch=master)](https://travis-ci.org/Azzaare/CompressedStacks.cpp)
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 The CompressedStacks.cpp module/library implements a time-space trade-off structure for stack's algorithms.