Remove codecov query in badge

Author: Ouroboros42

README.md

@@ -1,6 +1,6 @@
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-[![codecov.io](https://codecov.io/github/JuliaPhysics/NaturallyUnitful.jl/coverage.svg?branch=master)](https://codecov.io/github/JuliaPhysics/NaturallyUnitful.jl?branch=master)
+[![codecov.io](https://codecov.io/github/JuliaPhysics/NaturallyUnitful.jl/coverage.svg)](https://codecov.io/github/JuliaPhysics/NaturallyUnitful.jl)
 
 # NaturallyUnitful.jl
 A Julia package implementing flexible conversions via natural units for [Unitful.jl](https://github.com/JuliaPhysics/Unitful.jl). Reexports Unitful.