Fix coverage badge

Author: jonschumacher

README.md

@@ -4,6 +4,6 @@ Julia package for handling measured data for spherical t-designs used in [Magnet
 
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+[![codecov.io](https://codecov.io/gh/MagneticParticleImaging/MPISphericalHarmonics.jl/branch/main/graph/badge.svg)](https://app.codecov.io/github/MagneticParticleImaging/MPISphericalHarmonics.jl/tree/main)
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