update licensing and fixing py3.8 again

LICENSE

@@ -1,3 +1,5 @@
+BSD 3-Clause License
+
 Copyright (c) 2014, Thomas Cokelaer
 All rights reserved.
 

pyproject.toml

@@ -37,9 +37,17 @@ Documentation =  "https://colormap.readthedocs.io"
 
 
 [tool.poetry.dependencies]
-python = "^3.8"
-matplotlib = "^3"
-
+# to keep python3.8, we need this convoluated pins on matplotlbi and numpy
+# python 3.8 and python3.12 are quite afar wrt numpy installation.
+python = "^3.8,<4"
+matplotlib = [
+    {version = "^3.9.2", python ="^3.12"},
+    {version = "^3", python ="<3.12"},
+]
+numpy = [
+    {version = "^2", python ="^3.9"},
+    {version = "<2,", python ="<3.9"}
+]
 
 
 [tool.poetry.group.dev.dependencies]

src/colormap/__init__.py

@@ -7,9 +7,8 @@
 #
 # File author(s): Thomas Cokelaer <[email protected]>
 #
-# Distributed under the GPLv3 License.
-# See accompanying file LICENSE.txt or copy at
-# http://www.gnu.org/licenses/gpl-3.0.html
+#  Distributed under the terms of the 3-clause BSD license.
+#  The full license is in the LICENSE file, distributed with this software.
 #
 # Website: https://www.github.com/cokelaer/colormap
 # Documentation: http://packages.python.org/colormap

src/colormap/colors.py

@@ -7,9 +7,8 @@
 #
 #  File author(s): Thomas Cokelaer <[email protected]>
 #
-#  Distributed under the GPLv3 License.
-#  See accompanying file LICENSE.txt or copy at
-#      http://www.gnu.org/licenses/gpl-3.0.html
+#   Distributed under the terms of the 3-clause BSD license.
+#   The full license is in the LICENSE file, distributed with this software.
 #
 #  Website: https://github.com/cokelaer/colormap
 #  Documentation: http://packages.python.org/colormap

src/colormap/get_cmap.py

@@ -6,11 +6,8 @@
 #
 #  File author(s): Thomas Cokelaer <[email protected]>
 #
-#  Distributed under the GPLv3 License.
-#  See accompanying file LICENSE.txt or copy at
-#      http://www.gnu.org/licenses/gpl-3.0.html
-#
-#  website:
+#  Distributed under the terms of the 3-clause BSD license.
+#  The full license is in the LICENSE file, distributed with this software.
 #
 ##############################################################################
 from colormap import Colormap

src/colormap/xfree86.py

@@ -7,9 +7,8 @@
 #
 # File author(s): Thomas Cokelaer <[email protected]>
 #
-# Distributed under the GPLv3 License.
-# See accompanying file LICENSE.txt or copy at
-# http://www.gnu.org/licenses/gpl-3.0.html
+# Distributed under the terms of the 3-clause BSD license.
+# The full license is in the LICENSE file, distributed with this software.
 #
 # Website: https://www.github.com/cokelaer/colormap
 # Documentation: http://packages.python.org/colormap