release notes: indicate the issue on MacOS
release notes: fixed title
Fixes #22 - callback of webpage.open() was not called after a redirection
Fixes #18 - Multiple instance of SlimerJS could not launch at the same time
Fixes #17 - Resource id should start at 1, not 0
update release notes
Merge branch 'v0.6'

Conflicts:
	docs/release-notes.rst