Replace deprecated .Hugo with hugo. (#171)

John Tobin

23.17.2019 87879a726ac03f6689904ca36263f7d53d1ba31f

 theme.toml

@@ -19,7 +19,7 @@
  "single-column",
  "syntax-highlighting"
]
min_version = "0.43"
min_version = "0.54"

[author]
  name = "Luiz F. A. de Prá"