Added optional no-skipping-dialogue feature

Added optional feature of “no skipping dialogue until text is shown,”
which prevents users from tapping to the next line of dialogue until
the current dialogue has completely shown (that is, the text label’s
alpha/opacity value is at 1.0)
updated readme.md

Updated readme.md
Merge branch 'master' of https://github.com/elfketchup/EKVN

Conflicts:
	README.md