v3.4.0: - No stdin for python calls from bash completion functions (#488)

• No stdin for python calls from bash completion functions (#488)

  Prevents usage of stdin by (python) executables that are called
  during completion generation. This prevents the completion locking
  up the entire shell when the python script is broken i.e. it enters
  an interactive mode (REPL) instead of generating the completions, as
  expected.
  

  • Localize shell variable REPLY to avoid overwriting users' value (#489)

    The variable REPLY is used by default by the read shell builtin to
    store the return value, and like all bash/zsh variables, is scoped
    globally. This change allows this variable to be used for other
    needs by appropriately scoping its internal use by an argcomplete
    utility function that uses read.