Log Message:
py-pyperclip: Update x11/py-pyperclip to 1.6.0

pkgsrc changes:
 - Fetch the `.tar.gz' distfile instead of the `.zip' one

Changes:
v1.6.0,  2017/11/08
Refactor all the code in a single file.

v1.5.32, 2017/10/29
Added limited cygwin support.

v1.5.31, 2017/10/29
Fixed another mistake where 'posix' was checked for OS X instead
of 'mac' due to a mistaken merge. Added lazy loading.

v1.5.30, 2017/10/29
Fixed the encoding that was set to "uft-8".

v1.5.29, 2017/10/29
Pyperclip works with qtpy module, osx can use objc now, set pyqt
as lower priority than xsel/xclip/klipper, add support for PyQt5.

v1.5.28, 2017/10/28
Capture stderr of xclip subprocess, fixed issue #88 where emojii
cut off the last character, allowed selection between PRIMARY and
CLIPBOARD for xsel and xclip.

v1.5.27, 2016/03/14
Disable broken cygwin implementation until issue 55 can be fixed.

v1.5.26, 2016/01/20
Fix #51, Replace wcscpy_s with memmove for Windows XP.