readme: add line about column types

Author: sirupsen

README.md

@@ -10,6 +10,7 @@ rows across two different databases.
 * ⇄  Verifies across [many different databases][dbs] (e.g. PostgreSQL -> Snowflake)
 * 🔍 Outputs [diff of rows](#example-command-and-output) in detail
 * 🚨 Simple CLI/API to create monitoring and alerts
+* 🔁 Bridges column types of different formats and levels of precision (e.g. Double ⇆ Float ⇆ Decimal)
 * 🔥 Verify 25M+ rows in <10s, and 1B+ rows in ~5min.
 * ♾️  Works for tables with 10s of billions of rows