Update README.md

Merge pull request #30 from giladreich/add_messagebox

Merge pull request #29 from giladreich/fix_list

Merge pull request #28 from giladreich/fix_filters

Fix list on macOS to return false when the user canceled.

Implement simple MessageBox dialog, where no icon will be displayed.

Exclude filtering in file dialog when it's a directory.

Merge pull request #27 from razzie/master

Fixed js build errors

Merge pull request #26 from eth-p/master

Fix Darwin implementation to escape input sent to osascript

Merge pull request #25 from philenius/bugfix/incorrect-direcory-path-on-windows

fix dirDialog: incorrect result if path too short

Merge pull request #24 from samschurter/master

adds autofocus to message box on windows