Fix badges in README

README.md

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 # StructArrays
 
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-[![codecov.io](http://codecov.io/github/JuliaArrays/StructArrays.jl/coverage.svg?branch=master)](http://codecov.io/github/JuliaArrays/StructArrays.jl?branch=master)
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 This package defines an array type, `StructArray`, which acts like an array of `struct` elements but which internally is stored as a list of arrays, typically one per field of the `struct`. See the [documentation](https://JuliaArrays.github.io/StructArrays.jl/stable) for details.