Announce dropping support Python 2 & 3.8 in PyShp 3.0.0

Author: JamesParrott

README.md

@@ -97,6 +97,17 @@ part of your geospatial project.
 
 ## 2.4.0
 
+### Breaking Change.  Support for Python 2 and Pythons <= 3.8 to be dropped.
+- PyShp 2.4.0 is the latest (and likely last) version of PyShp to support Python 2.7 and Pythons <= 3.8.
+These CPython versions have reached [end of life](https://devguide.python.org/versions/#versions).
+- Future development will focus on PyShp v3.0.0 onwards (currently intended to supporting Pythons >= 3.9).
+- This will not break any projects, as pip and other package managers should not install PyShp 3.0.0
+(after its release) in unsupported Pythons.  But we no longer promise such projects will get PyShp's latest
+bug fixes and features.
+- If this negatively impacts your project, all feedback about this decision is welcome
+on our [the discussion page](https://github.com/GeospatialPython/pyshp/discussions/290).
+
+
 ### New Features:
 - Reader.iterRecords now allows start and stop to be specified, to lookup smaller ranges of records.
 - Equality comparisons between Records now also require the fields to be the same (and in the same order).