gptel: Bump version, README tweaks

gptel.el: Bump version.

NEWS: Bump version.

README.org: Expand Alternatives section.

gptel: Bump version to v0.9.9

gptel.el: Bump version to v0.9.9

NEWS: Update section for 0.9.9.

gptel: Bump version to 0.9.8.5, add release date

* gptel.el: Bump version
* NEWS (0.9.8.5): Add date

gptel: Bump version to v0.9.8

* gptel.el: Update version and package description.

gptel: Bump version, require cl-lib

* gptel.el: Bump package version to 0.9.7.  Require cl-lib at
run-time -- we already do in the other gptel libraries, so it's
not worth working around it any more.  Update package commentary.

gptel: Bump version

* gptel.el: Bump version in header, improve package commentary.

gptel: Bump version

* gptel.el: Bump version to 0.9.5

gptel: Bump version

* gptel.el: Bump gptel version to 0.9.0.

gptel: Update description and bump version

gptel.el (header): Update description and bump version.

gptel: Release v0.8.5

* gptel.el: Bump version.