REL: prepare release

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased] ##
+## [0.3.1] - 2021-12-06  ##
 
 ### Added ###
 - `check_reference_field` function to check whether entities with provided ids
@@ -12,16 +12,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - added the `datatypes` argument to `TableImporter` for columns that do not 
   need a special conversion function
 
-### Changed ###
-
-### Deprecated ###
-
-### Removed ###
-
-### Fixed ###
-
-### Security ###
-
 ## [0.3.0] - 2021-11-02 ##
 
 ### Added ###

setup.py

@@ -49,7 +49,7 @@ MAJOR = 0
 MINOR = 3
 MICRO = 1
 PRE = ""  # e.g. rc0, alpha.1, 0.beta-23
-ISRELEASED = False
+ISRELEASED = True
 
 if PRE:
     VERSION = "{}.{}.{}-{}".format(MAJOR, MINOR, MICRO, PRE)