Update version to 1.5~rc1

# Please enter the commit message for your changes. Lines starting
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# On branch master
# Changes to be committed:
#   (use "git reset HEAD^1 <file>..." to unstage)
#
#	modified:   ChangeLog
#	modified:   data/whisperback.desktop
#	modified:   debian/changelog
#	modified:   doc/whisperback.t2t
#	modified:   setup.py
#	modified:   whisperBack/gui.py
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	.whisperBack.swp
#	config.py
#	data/whisperback.ui.h
#	dist/
#	doc/.config.py.sample.swp
#	doc/whisperback.1
#	po/fr.mo
#	po/whisperback.pot
#	pylintrc
#	scripts/
