Remove base docker image, -v shows commit hash

[sadayuki-matsuno]

remove the vuls/base docker image.

To apply these changes, you must remove the original docker images: vuls/vuls vuls/go-cve-dictionary docker and pull the new images.

[sadayuki-matsuno]

Vuls version information is embedded to these docker images.

$ docker run  --rm  vuls/vuls -v
vuls v0.1.6 63f0a27

$ docker run --rm vuls/go-cve-dictionary -v
go-cve-dictionary v0.1.0 8465a01

[kotakanbe]

Thanks!