passport 0.3.0

• Add nato dataset of NATO/OTAN member defense expenditures.
• Remove "dstk" option for parse_country() as the Data Science Tookit API appears dead.
• Refactor README and vignette to use explicit packages instead of tidyverse.

passport 0.2.0

• Add order_countries() to make sorting vectors of countries simpler, particularly when passed to the limits parameter of a ggplot2 discrete scale.
• Change country_format() to accept a factor parameter along to as_country_name().
• Update documentation and tests to account for DSTK downtime.

passport 0.1.1

• Added a NEWS.md file to track changes to the package.
• Added option to use geocoding web APIs to supercharge parse_country().
• Added convert_country() constructor for ggplot2 convenience.
• Added essential API for converting between country names and codes.