now prompt_add_history adopt entry argument
encapsulated fgetwchar, fixed tab cursorsize
update witg wchar support
Update prompt.c
Merge branch 'wchar-implementation'

Conflicts:
	prompt.c
Update prompt.c
Update README.md
Merge commit 'def4373076e847bc4801f3907354fb46e92fdb41' into wchar-implementation

Conflicts:
	prompt.c