Add matplotlib as dependance.

pyproject.toml

@@ -4,7 +4,8 @@ name="aidge_core"
 description="Core algorithms for operators and graph of the AIDGE framework"
 dependencies = [
     "numpy>=1.21.6",
-    "Jinja2>=3.1.2"
+    "Jinja2>=3.1.2",
+    "matplotlib"
 ]
 requires-python = ">= 3.7"
 readme = "README.md"