2.8.0

CHANGES:

• If the current working directory is the home directory, then
  do not load .ocamlinit (@hyphenrf @copy #338)
• With OCaml 4.12.0 and later, the toplevel uses the toplevel
  state to exit with the right status code (#348 @Octachron)
• Fix color highlight for errors (#350 @chripell)
• Add support for OCaml 4.13 (#353 @kit-ty-kate)

Emacs mode fixes:

• Company text-completion fixes (@leungbk #340)
• utop-query-arguments always returns (utop-arguments) whether
  it sets the utop-command or not (@dansanduleac #347)
• Fix completion returning bogus candidates (#352 @chripell @rgrinberg)