Bump version and update changelog

Author: sloria

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 7.3.1 (2020-03-22)
+
+- Fix error when parsing empty list with subcast
+  [#137](https://github.com/sloria/environs/issues/137).
+  Thanks [sabdouni] for the catch and patch.
+
 ## 7.3.0 (2020-03-01)
 
 - `log_level` accepts lower-cased log level names and rejects invalid

environs/__init__.py

@@ -15,7 +15,7 @@
 import marshmallow as ma
 from dotenv.main import load_dotenv, _walk_to_root
 
-__version__ = "7.3.0"
+__version__ = "7.3.1"
 __all__ = ["EnvError", "Env"]
 
 MARSHMALLOW_VERSION_INFO = tuple(int(part) for part in ma.__version__.split(".") if part.isdigit())