message: Update readme now that building with Apple clang works properly
diff: @@ -70,10 +70,12 @@ Installing OpenCV is easy through the following sources:
  Get OpenCV from homebrew:
  -* [homebrew](https://brew.sh), be sure to also install `llvm` and `pkg-config` that are required for building:
  +* [homebrew](https://brew.sh), be sure to also install `pkg-config` that is required for building:
  ```shell script
  - brew install llvm pkg-config opencv
  + brew install pkg-config opencv
  ```
  + You will also need a working C++ compiler and libclang, you can use the ones from XCode or install `llvm`
  + from brew. You most probably need to also check the item 5 of the troubleshooting below.
  ### Manual build
  @@ -118,6 +120,16 @@ You need to set up the following environment variables to point to the installed
  variable correctly or copy the dll next to the binary you're trying to run. Check
  [that](https://github.com/twistedfall/opencv-rust/issues/118#issuecomment-619608278) guide too.
  +5. On macOS you're getting the `dyld: Library not loaded: @rpath/libclang.dylib` error during the build process.
  +
  + OS can't find `libclang.dylib` dynamic library because it resides in a non-standard path, set up
  + the `DYLD_FALLBACK_LIBRARY_PATH` environment variable to point to the path where libclang.dylib can be
  + found, e.g. for Xcode:
  +
  + ```
  + export DYLD_FALLBACK_LIBRARY_PATH="$(xcode-select --print-path)/Toolchains/XcodeDefault.xctoolchain/usr/lib/"
  + ```
  +
  ## Reporting issues
  If you still have trouble using the crate after going through the Troubleshooting steps please fill free to
  