ANNOUNCE: weewx-aqi v1.4

[spam-...@robotmonkeys.net]

I pushed a new version of WeeWx-AQI .  This adds supports Australia and European Union standards.

Changes:

• Updates India's breakpoint table for lead
• Adds support for Australia's Air Quality Index
• Adds support for Australia's Interim Web Reporting Particulate Index (February 2020)
• Adds support for European Union's European Air Quality Index
• Adds support for European Union's Common Air Quality Hourly Index
• Changes AQI type registration from air_quality_index to count for XType compatibility

Download from https://github.com/jonathankoren/weewx-aqi/releases/tag/v1.4