Add nteract renderer detection

Author: jonmmease

Diff for: packages/python/plotly/plotly/io/_renderers.py

@@ -471,6 +471,10 @@ def show(fig, renderer=None, validate=True, **kwargs):
     if not default_renderer and "VSCODE_PID" in os.environ:
         default_renderer = "vscode"
 
+    # Cheick if we're running in nteract
+    if not default_renderer and "NTERACT_EXE" in os.environ:
+        default_renderer = "nteract"
+
     # Fallback to renderer combination that will work automatically
     # in the classic notebook (offline), jupyterlab, nteract, vscode, and
     # nbconvert HTML export.