update changelog

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Route location
 ## Changed
 - Dim income_level in route pibpercapita now uses a different table, pib_quintis
+- Population now uses ibge_pib table
 
 ## 1.14.2 - 2020-07-14
 ## Changed