v3.1.2

• Upgraded aws-sdk-go (#32, #35, #39, #47)
• Allow overriding session duration per role (#42)
• Added region mapping per account/role (#36, #49)
• Clarified messaging in configure command (#37)
• Removed misleading error message on secondary assumption when no roles provided (#33)
• Added invalid login tracking (#48)
• Added --password argument (#46)