Removed detail in README about removed functionality

Merge pull request #15 from pachi-belero/patch-1

Fix for __shini_parse_error calls no longer working (thanks to @pachi-belero )

Update README.md

Got rid of release info - added short usage example of writing INI files.

Fixed issue for older versions of grep ... where handling of regex re…

…quires dashes to be listed last in character classes.