Update cwls.org link
Update cwls.org link

This pull request updates the cwls link.  The old link currently goes to a 'not found' page on the cwls.org site.
- Add https to the link
- Go directly to the cwls.org page and location for las specifications.

Let me know if this change could be accepted (or rejected) or
needs some additional changes before being approved and merged.

Thank you,
DC
kwinkunks/lasio,kinverarity1/lasio,kinverarity1/las-reader