🔖 0.6.4

[pwwang]

Breaking changes

• 🩹 Make base.ntile() labels 1-based (🩹 Make base.ntile() labels 1-based #92)

Fixes

• 🐛 Fix order_by argument for dplyr.lead-lag

Enhancements

• 🚑 Allow base.paste/paste0() to work with grouped data
• 🩹 Change dtypes of base.letters/LETTERS/month_abb/month_name

Housekeeping

• 📝 Update and fix reference maps
• 📝 Add environment.yml for binder to work
• 📝 Update styles for docs
• 📝 Update styles for API doc in notebooks
• 📝 Update README for new description about the project and add examples from StackOverflow