SceneObj show kwarg in docstring but it cannot be provided

[cboulay]

SceneObj's docstring lists show as a kwarg:

visbrain/visbrain/objects/scene_obj.py

Lines 339 to 347 in b599038

	class SceneObj(object):
	"""Create a scene and add objects to it.
	Parameters
	----------
	bgcolor : string | 'black'
	Background color of the scene.
	show : bool | True
	Display the canvas.

However, it isn't an explicit kwarg in the constructor

visbrain/visbrain/objects/scene_obj.py

Lines 361 to 362 in b599038

	def __init__(self, bgcolor='black', camera_state={}, verbose=None,
	**kwargs):

so it gets dumped into kwargs. **kwargs is then passed on to the SceneCanvas constructor, which also has an explicit show=False,

visbrain/visbrain/objects/scene_obj.py

Lines 368 to 370 in b599038

	self.canvas = scene.SceneCanvas(keys='interactive', show=False,
	title='Object scene',
	bgcolor=color2vb(bgcolor), **kwargs)

thus giving SceneCanvas two different values for show, raising an error.

A simple fix is to put show=True in the SceneObj init , then modify the call to create a SceneCanvas object to pass in show=show.

I'm not putting this in a PR because, while the suggested modification is consistent with the docstring, it changes the default behaviour. To replicate the current behaviour, the SceneObj init should have show=False (and the docstring should be updated accordingly). I'm not sure what the "correct" desired behaviour is.