Document GeoDB; remove unused code; minor fixes

CHANGELOG.md

@@ -1,28 +1,47 @@
-# Version 0.5.0 (Jan 6, 2021)
+# Changelog
 
+All notable changes to this project will be documented in this file.
+
+- The format is based on [Keep a Changelog][changelog].
+- This project adheres to [Semantic Versioning][semver].
+- For versions before 1.0, we follow the [Pkg.jl convention][pkjjl]
+  that `0.a.b` is compatible with `0.a.c`.
+
+[changelog]: https://keepachangelog.com/en/1.0.0/
+[semver]: https://semver.org/spec/v2.0.0.html
+[pkjjl]: https://pkgdocs.julialang.org/v1/compatibility/#compat-pre-1.0
+
+## [Unreleased]
+## Added
+- Allow user to specify locations as unique identifiers, instead of latitude and longitude (e.g. `us-state:IL` or `2018-us-county:17043`)
+
+## [0.5.0] -- 2021-01-06
+## Added
 - Allow plants to store input material for processing in later years
 
-# Version 0.4.0 (Sep 18, 2020)
-
+## [0.4.0] -- 2020-09-18
+## Added
 - Generate simplified solution reports (CSV)
 
-# Version 0.3.3 (Aug 13, 2020)
-
+## [0.3.3] -- 2020-10-13
+## Added
 - Add option to write solution to JSON file in RELOG.solve
 - Improve error message when instance is infeasible
 - Make output file more readable
 
-# Version 0.3.2 (Aug 7, 2020)
-
+## [0.3.2] -- 2020-10-07
+## Added
 - Add "building period" parameter
 
-# Version 0.3.1 (July 17, 2020)
-
+## [0.3.1] -- 2020-07-17
+## Fixed
 - Fix expansion cost breakdown
 
-# Version 0.3.0 (June 25, 2020)
-
+## [0.3.0] -- 2020-06-25
+## Added
 - Track emissions and energy (transportation and plants)
+
+## Changed
 - Minor changes to input file format:
     - Make all dictionary keys lowercase
     - Rename "outputs (tonne)" to "outputs (tonne/tonne)"