Update master/main change

Author: phipsgabler

README.md

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 # AbstractPPL.jl
 
-[![CI](https://github.com/TuringLang/AbstractPPL.jl/workflows/CI/badge.svg?branch=master)](https://github.com/TuringLang/AbstractPPL.jl/actions?query=workflow%3ACI+branch%3Amaster)
-[![IntegrationTest](https://github.com/TuringLang/AbstractPPL.jl/workflows/IntegrationTest/badge.svg?branch=master)](https://github.com/TuringLang/AbstractPPL.jl/actions?query=workflow%3AIntegrationTest+branch%3Amaster)
-[![Coverage Status](https://coveralls.io/repos/github/TuringLang/AbstractPPL.jl/badge.svg?branch=master)](https://coveralls.io/github/TuringLang/AbstractPPL.jl?branch=master)
-[![Codecov](https://codecov.io/gh/TuringLang/AbstractPPL.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/TuringLang/AbstractPPL.jl)
+[![CI](https://github.com/TuringLang/AbstractPPL.jl/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/TuringLang/AbstractPPL.jl/actions/workflows/CI.yml?query=branch%3Amain)
+[![IntegrationTest](https://github.com/TuringLang/AbstractPPL.jl/actions/workflows/IntegrationTest.yml/badge.svg?branch=main)](https://github.com/TuringLang/AbstractPPL.jl/actions/workflows/IntegrationTest.yml?query=branch%3Amain)
+[![Coverage Status](https://coveralls.io/repos/github/TuringLang/AbstractPPL.jl/badge.svg?branch=main)](https://coveralls.io/github/TuringLang/AbstractPPL.jl?branch=main)
+[![Codecov](https://codecov.io/gh/TuringLang/AbstractPPL.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/TuringLang/AbstractPPL.jl)
 
 A new light-weight package to factor out interfaces and associated APIs for modelling languages for
 probabilistic programming.  High level goals are: