rlang 0.3.2

• Fixed protection issue reported by rchk.

• The experimental option rlang__backtrace_on_error is no longer
  experimental and has been renamed to rlang_backtrace_on_error.

• New "none" option for rlang_backtrace_on_error.

• Unary operators applied to quosures now give better error messages.

• Fixed issue with backtraces of warnings promoted to error, and
  entraced via withCallingHandlers(). The issue didn't affect
  entracing via top level options(error = rlang::entrace) handling.