Remove outdated badges

Author: alexcrichton

README.md

@@ -5,8 +5,6 @@
 **Facilitating high-level interactions between wasm modules and JavaScript.**
 
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-[![Build status](https://ci.appveyor.com/api/projects/status/559c0lj5oh271u4c?svg=true)](https://ci.appveyor.com/project/alexcrichton/wasm-bindgen)
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