add note about running in terminal, not iTerm

[scottleibrand]

... to avoid sveinbjornt/hear#15

When running in iTerm, hear gives Abort trap: 6, but that doesn't get trapped, so the resulting error is an attempted fork loop:

Starting ./hear
huggingface/tokenizers: The current process just got forked, after parallelism has already been used. Disabling parallelism to avoid deadlocks...
To disable this warning, you can either:
	- Avoid using `tokenizers` before the fork if possible
	- Explicitly set the environment variable TOKENIZERS_PARALLELISM=(true | false)
Starting ./hear
huggingface/tokenizers: The current process just got forked, after parallelism has already been used. Disabling parallelism to avoid deadlocks...
To disable this warning, you can either:
	- Avoid using `tokenizers` before the fork if possible
	- Explicitly set the environment variable TOKENIZERS_PARALLELISM=(true | false)
Starting ./hear

etc.

[n2nco]

Case it helps anyone reading, this applies to running Teleprompter in VS Code integrated terminal - same error: