Update index.rst

Author: joa-quim

download/index.rst

@@ -12,7 +12,8 @@ GMT Releases
 GMT is available on Windows, macOS, Linux and FreeBSD. Source and binary packages are provided
 from `GitHub <https://github.com/GenericMappingTools/gmt/releases>`__:
 
-* `GMT 6.5.0 <https://github.com/GenericMappingTools/gmt/releases/tag/6.5.0>`__ (**recommended**)
+* `GMT 6.6.0 <https://github.com/GenericMappingTools/gmt/releases/tag/6.5.0>`__ (**recommended**)
+* `GMT 6.5.0 <https://github.com/GenericMappingTools/gmt/releases/tag/6.5.0>`__
 * `GMT 6.4.0 <https://github.com/GenericMappingTools/gmt/releases/tag/6.4.0>`__
 * `GMT 6.3.0 <https://github.com/GenericMappingTools/gmt/releases/tag/6.3.0>`__
 * `GMT 6.2.0 <https://github.com/GenericMappingTools/gmt/releases/tag/6.2.0>`__