Add JupyterLab dependency to pyproject.toml

pyproject.toml

@@ -9,6 +9,9 @@ keywords = ["jupyter", "notebook", "asciidoc"]
 requires-python = ">=3.6"
 license = {text = "custom"}
 readme = "README.md"
+dependencies = [
+    "jupyterlab>=2.3.2",
+]
 
 [project.urls]
 Homepage = "https://github.com/fastai/fastbook/tree/master/"
@@ -27,4 +30,4 @@ host = "github"
 audience = "Developers"
 language = "English"
 status = 2
-copyright = "fast.ai"
+copyright = "fast.ai"