v0.4

• Support new Docker image model by querying image history.
• Adjust size label depending on which type of size was requested (incremental or cumulative).

$ sha1sum dockviz_*
f1a69828deb7aa86890e9402c7e70bf716d6a595  dockviz_darwin_amd64
abfef28d26472dc75dcd57cded0b24a678d8c91a  dockviz_linux_amd64
605fe8c150741d4785a3131cca350e2892a10dc9  dockviz_linux_arm
$ sha256sum dockviz_*
ff71202ed5cc52318da2fc25d51a233dceedc8197fae265de3a64ecfffa4091b  dockviz_darwin_amd64
a01f6f6ead60f8011d6153bba859909e14e1aff69beb205de8d5920d4fa7c44e  dockviz_linux_amd64
03cc4086282db8b49078d8b368bf75cde23b067632e50247c5fcbe3e7f2f7b7e  dockviz_linux_arm
$ md5sum dockviz_*
be92523df987be5463b76e48b7734c66  dockviz_darwin_amd64
b095740984610043d39aff7719e2c30e  dockviz_linux_amd64
33d7093e27c0ecf71a7301df8fd7bd17  dockviz_linux_arm