title: Error installing provider "aws": openpgp: signature made by unknown entity
body: <p>I am using terraform version 0.11.13, and this afternoon I am getting the following error in <em>terraform init</em> step
  Does it mean I've to upgrade the terraform version, is there a deprecation for this version for aws provider?</p>
  <p>Full logs:</p>
  <pre><code>Successfully configured the backend &quot;s3&quot;! Terraform will automatically
  use this backend unless the backend configuration changes.
  
  [1mInitializing provider plugins...
  - Checking for available provider plugins on https://releases.hashicorp.com...
  
  Error installing provider &quot;aws&quot;: openpgp: signature made by unknown entity.
  
  Terraform analyses the configuration and state and automatically downloads
  plugins for the providers used. However, when attempting to download this
  plugin an unexpected error occured.
  
  This may be caused if for some reason Terraform is unable to reach the
  plugin repository. The repository may be unreachable if access is blocked
  by a firewall.
  
  If automatic installation is not possible or desirable in your environment,
  you may alternatively manually install plugins by downloading a suitable
  distribution package and placing the plugin's executable file in the
  following directory:
      terraform.d/plugins/linux_amd64
  </code></pre>