All items are indexed "item [1]" in the output

[nilthehuman]

A 'tier_count = tier_count + 1' is missing from this loop:

Praat-textgrids/textgrids/__init__.py

Line 250 in 58f4ae1

for name, tier in self.items():

[leozqi]

I also noticed this and made a pull request here: #14