remove outdated link to travis CI, bump version to 1.12.4

Author: dimpase

README.rst

@@ -1,11 +1,8 @@
 cysignals: interrupt and signal handling for Cython
 ===================================================
 
-.. image:: https://travis-ci.org/sagemath/cysignals.svg?branch=master
-    :target: https://travis-ci.org/sagemath/cysignals
-
 .. image:: https://readthedocs.org/projects/cysignals/badge/?version=latest
-    :target: http://cysignals.readthedocs.org
+    :target: https://cysignals.readthedocs.org
 
 Cython and interrupts
 ---------------------

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "mesonpy"
 
 [project]
 name = "cysignals"
-version = "1.12.3"
+version = "1.12.4"
 description = "Interrupt and signal handling for Cython"
 license = { file = "LICENSE" }
 readme = { file = "README.rst", content-type = "text/x-rst" }