message: Update DYLD_FALLBACK_LIBRARY_PATH
  Update README.md with new path for DYLD_FALLBACK_LIBRARY_PATH.
  On MacOS catalin 10.15.7 , the command line tools folder has changed. It no longer contains the Toolchains directory
diff: @@ -135,7 +135,7 @@ You need to set up the following environment variables to point to the installed
  found, e.g. for Xcode:
  ```
  - export DYLD_FALLBACK_LIBRARY_PATH="$(xcode-select --print-path)/Toolchains/XcodeDefault.xctoolchain/usr/lib/"
  + export DYLD_FALLBACK_LIBRARY_PATH="$(xcode-select --print-path)/usr/lib/"
  ```
  ## Reporting issues
  