* builder/amazon: Error validating credentials is no longer obscured by a region validation error. [GH-6865]
* core: Fix race conditions in progress bar code [GH-6858], [GH-6788], [GH-6851]
* post-processor/manifest: No longer provides an empty ID string for Azure's managed image artifact [GH-6822]
* provisioner/powershell: Fix a bug in the way we set the ProgressPreference variable in the default `execute_command` [GH-6838]
* builder/amazon: Fix error calculating defaults in AWS waiters. [GH-6727]
* provisioner/windows-restart: Fix extraneous break which forced early exit from our wait loop. [GH-6792]
* builder/azure: Updated Azure/go-ntlmssp dependency to resolve an issue with the winrm communicator not connecting to Windows machines requiring NTLMv2 session security
* builder/amazon: Waiter now fails rather than hanging for extra time when an image import fails. [GH-6747]
* core: Fix logger so it doesn't accidentally try to format unescaped strings. [GH-6824]
* builder/amazon: Increase default wait for image import to one hour. [GH-6818]
* core: Fix error where logging was always enabled when Packer was run from inside Terraform. [GH-6758]
* builder/alicloud: Fix type error in step_create_tags [GH-6763]
* builder/scaleway: Fix issues with ssh keys. [GH-6768]
* core: Fix various places in multiple builders where config was not being passed as a pointer. [GH-6739]
## 1.3.1 (September 13, 2018)
### IMPROVEMENTS:
* builder/amazon: automatically decode encoded authorization messages if
possible [GH-5415]
* builder:amazon: Optional cleanup of the authorized keys file [GH-6713]
* builder/qemu: Fixed bug where a -device in the qemuargs would override the default network settings, resulting in no network [GH-6807]
### BUG FIXES:
* builder/amazon: fix bugs relating to spot instances provisioning [GH-6697]