Environment.render() does nothing with default arguments

Hi there,

Like the title says it looks like the default behaviour for rendering is not quite working. The following code does not print anything.

from kaggle_environments import make, evaluate, utils
env=make("connectx", debug=True)
env.render()

From the documentation it looks like this should print out the state of the game in ASCII. It looks to be an issue with the core render function rather than the connectx environment as other environment types exhibit the same behaviour.

Reproduce the example with kaggle_environments.make("connectx", debug=True) and inspect Environment.render() and the core render path, comparing them with the documentation's ASCII-rendering expectation. Check whether other environment types show the same behavior; done means env.render() prints the current game state using default arguments.

Written by the indexing model from the issue text.