v1.0.4: various updates and add publishing automation (#95)

• Updates to the readme.

v0.3.1

0.3.1

• Added SharedStdIn.nextLine (similar to readLineSync) and lines:

main() async {
  // Prints the first line entered on stdin.
  print(await sharedStdIn.nextLine());
  
  // Prints all remaining lines.
  await for (final line in sharedStdIn.lines) {
    print(line);
  }
}

• Added a copyPath and copyPathSync function, similar to cp -R.

• Added a dependency on package:path.

• Added the remaining missing arguments to ProcessManager.spawnX which
  forward to Process.start. It is now an interchangeable function for running
  a process.

v0.3.0

0.3.0

• BREAKING CHANGE: The arguments argument to ProcessManager.spawn is
  now positional (not named) and required. This makes it more similar to the
  built-in Process.start, and easier to use as a drop in replacement:

processManager.spawn('dart', ['--version']);

• Fixed a bug where processes created from ProcessManager.spawn could not
  have their stdout/stderr read through their respective getters (a runtime
  error was always thrown).

• Added ProcessMangaer#spawnBackground, which does not forward stdin.

• Added ProcessManager#spawnDetached, which does not forward any I/O.

• Added the shellSplit() function, which parses a list of arguments in the
  same manner as the POSIX shell.