Fix repeated package name

[dchiu911]

• Fixes bug reported in New load message repeats package name #94 regarding odd number of packages to attach

[jennybc]

I think this is a bit cleaner. Will you change in your branch?

if (length(packages) %% 2 == 1) {
    packages <- append(packages, "")
  }
col1 <- seq_len(length(packages)/2)
info <- paste0(packages[col1], "     ", packages[-col1])

[jennybc]

Thanks!