Log Message:
Update ruby-curses-gem to 1.2.0.

1.2.0 / 2017-02-19

New features:

* Add Curses.assume_default_colors.

Bug fixes:

* Curses.unget_char should use String#ord even if unget_wch() is not available.
* The default value of keyboard_encoding should be ASCII-8BIT if get_wch() is
  not available.
* NUM2ULONG() should be used in Window#bkgd etc.

1.1.3 / 2017-02-08

Bug fixes:

* Update PDCurses to handle extended keys.

1.1.2 / 2017-02-06

Bug fixes:

* Use the left-alt-fix branch of https://github.com/shugo/PDCurses.git to get
  ALT + < etc.

1.1.1 / 2017-01-25

Bug fixes:

* Add -DPDC_WIDE to CPPFLAGS when compiling with PDCurses.

1.1.0 / 2017-01-24

New features:

* Use bundler instead of hoe. Pull request #18 by hsbt.
* Enable appveyor. Pull request #19 by hsbt.
* Add badges for build status to README.md. Pull request #20 by hsbt.
* Add Curses.erase and Curses::Window.erase.
* Add Curses::Window.redraw.
* Add Curses.unget_char, Curses.get_char, and Curses::Window.get_char for
  multibyte characters.
* Add Curses.keyboard_encoding and Curses.terminal_encoding.
* Support cross compilation for mingw32.

Bug fixes:

* Fix error in attron/attroff documentation. Pull request #14 by stomar.
* Improve code samples. Pull request #15 by stomar.