test build

yeesian/ArchGDAL.jl#315 (comment)

```
ERROR: LoadError: LoadError: InitError: could not load library "/Users/runner/.julia/artifacts/525a7050baaa2b0732225f4528525dfb3cfed1df/lib/libproj.25.dylib"
dlopen(/Users/runner/.julia/artifacts/525a7050baaa2b0732225f4528525dfb3cfed1df/lib/libproj.25.dylib, 1): Library not loaded: @rpath/libcurl.4.dylib
  Referenced from: /Users/runner/.julia/artifacts/525a7050baaa2b0732225f4528525dfb3cfed1df/lib/libproj.25.9.0.1.dylib
  Reason: Incompatible library version: libproj.25.dylib requires version 13.0.0 or later, but libcurl.4.dylib provides version 12.0.0
```

README.md

@@ -1,3 +1,5 @@
+do not merge
+
 # Proj.jl
 
 [![CI](https://github.com/JuliaGeo/Proj.jl/workflows/CI/badge.svg)](https://github.com/JuliaGeo/Proj.jl/actions?query=workflow%3ACI)