v3.7.2

Fixes the following bugs related to the automatic migration of the alks.db file:

• moves the logic for ensuring that the ~/.alks-cli directory is created into its own function so that it can guarantee the existence of the directory before trying to move or read files in that location
• re-adds support for the ALKS_DB environment variable for specifying a custom path for the alks.db file (which was broken by a recent update) to support legacy use cases