updated CMakeLists.txt

Author: MamoruSobue

CMakeLists.txt

@@ -14,7 +14,7 @@ find_package(pybind11 2.4.3 REQUIRED)
 # check matplotlib minor version
 execute_process(
   COMMAND
-  "python3" "-c"
+  ${Python3_EXECUTABLE} "-c"
   "import matplotlib;
 print(str(matplotlib.__version__))"
   RESULT_VARIABLE MATPLOTLIB_VERSION_CHECKING

README.md

@@ -13,7 +13,7 @@ It is supposed to provide the user with almost full access to matplotlib feature
 - [pybind11](https://github.com/pybind/pybind11) >= 2.4.3
   - `sudo apt install pybind11-dev` (on Ubuntu20.04)
   - or manual install
-- compatible with [matplotlib](https://matplotlib.org/stable/index.html) == 3.5.1
+- [matplotlib](https://matplotlib.org/stable/index.html) >= 3.4.0
 - numpy for `mplot3d`
 - ([xtensor](https://github.com/xtensor-stack/xtensor) == 0.24.0 + [xtl](https://github.com/xtensor-stack/xtl), only for `gallery` demos)