updated readme

README.md

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 [![codecov.io](http://codecov.io/github/kul-forbes/ProximalAlgorithms.jl/coverage.svg?branch=master)](http://codecov.io/github/kul-forbes/ProximalAlgorithms.jl?branch=master)
 
 Proximal algorithms (also known as "splitting" algorithms or methods) for nonsmooth optimization in Julia.
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 This package can be used in combination with [ProximalOperators.jl](https://github.com/kul-forbes/ProximalOperators.jl) (providing first-order primitives, i.e. gradient and proximal mapping, for numerous cost functions) and [AbstractOperators.jl](https://github.com/kul-forbes/AbstractOperators.jl) (providing several linear and nonlinear operators) to formulate and solve a wide spectrum of nonsmooth optimization problems.
 
 ### Implemented Algorithms