fix travis link

Author: shashi

README.md

@@ -2,7 +2,7 @@
 
 SymbolicUtils.jl provides various utilities for symbolic computing.
 
-[![Build Status](https://travis-ci.org/JuliaSymbolics/SymbolicUtils.jl.svg?branch=master)](https://travis-ci.org/JuliaSymbolics/SymbolicUtils.jl)  [![Coverage Status](https://coveralls.io/repos/github/JuliaSymbolics/SymbolicUtils.jl/badge.svg?branch=master)](https://coveralls.io/github/JuliaSymbolics/SymbolicUtils.jl?branch=master)
+[![Build Status](https://travis-ci.org/JuliaSymbolics/SymbolicUtils.jl.svg?branch=master)](https://travis-ci.com/github/JuliaSymbolics/SymbolicUtils.jl)  [![Coverage Status](https://coveralls.io/repos/github/JuliaSymbolics/SymbolicUtils.jl/badge.svg?branch=master)](https://coveralls.io/github/JuliaSymbolics/SymbolicUtils.jl?branch=master)
 
 ## Variables and expressions