Prepare release of 1.20.

Author: scoder

CHANGES.rst

@@ -1,7 +1,7 @@
 ChangeLog
 =========
 
-1.20 (2025-??-??)
+1.20 (2025-06-13)
 -----------------
 
 * ``quicktions`` is compatible with freethreading Python (3.13+).
@@ -16,6 +16,8 @@ ChangeLog
 * Call ``__rpow__`` in ternary ``pow()`` if necessary, following
   https://github.com/python/cpython/pull/130251
 
+* Built using Cython 3.1.2.
+
 
 1.19 (2024-11-29)
 -----------------

src/quicktions.pyx

@@ -23,7 +23,7 @@ This is an almost-drop-in replacement for the standard library's
 
 __all__ = ['Fraction']
 
-__version__ = '1.19'
+__version__ = '1.20'
 
 cimport cython
 from cpython.unicode cimport Py_UNICODE_TODECIMAL