=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching iruby-0.4.0.gem
=> Total size: 101376 bytes
=> Checksum SHA1 OK for iruby-0.4.0.gem
=> Checksum RMD160 OK for iruby-0.4.0.gem
=> Checksum SHA512 OK for iruby-0.4.0.gem