fix text around cql support (#187)

fragments/filter/README.md

@@ -213,9 +213,11 @@ Formal definitions and grammars for CQL can be found here:
 
 These projects have or are developing CQL support:
 
-- [GeoPython PyCQL](https://github.com/geopython/pycql/tree/master/pycql), and the 
+Also ECQL is the old CQL standard defined in some old OGC CSW spec, not a superset of the current CQL Text standard from OGC API Features. (Which will be implemented soon).
+
+- [pygeofilter](https://github.com/geopython/pygeofilter) has support for the older ECQL standard (similar to CQL Text) and will soon have support for OGC API Part 3 CQL
+- [GeoPython PyCQL](https://github.com/geopython/pycql/tree/master/pycql) (discontinued), and the 
   [Bitner fork](https://github.com/bitner/pycql) to be used in stac-fastapi
-- [pygeofilter](https://github.com/geopython/pygeofilter) has support for ECQL (a superset of CQL Text) and CQL JSON
 - [Franklin](https://github.com/azavea/franklin) is working on it in [this PR](https://github.com/azavea/franklin/pull/750).
 - [Geotools](https://github.com/geotools/geotools) has support for [CQL text](https://github.com/geotools/geotools/tree/main/modules/library/cql/src/main/java/org/geotools/filter/text/cql2)