Update all dependencies

Upgraded:
  db_connection 2.2.0 => 2.2.1
  earmark 1.4.2 => 1.4.3
  ecto 3.3.1 => 3.3.3
  ecto_sql 3.3.2 => 3.3.4
  esshd 0.1.0 => 0.1.1
  ex_doc 0.21.2 => 0.21.3
  excoveralls 0.12.1 => 0.12.2
  gettext 0.17.1 => 0.17.4
  html_entities 0.5.0 => 0.5.1
  httpoison 1.6.1 => 1.6.2
  joken 2.1.0 => 2.2.0
  jose 1.9.0 => 1.10.1
  nimble_parsec 0.5.1 => 0.5.3
  phoenix 1.4.10 => 1.4.13
  phoenix_ecto 4.0.0 => 4.1.0
  phoenix_html 2.13.3 => 2.14.0
  plug_cowboy 2.1.0 => 2.1.2
  plug_crypto 1.1.0 => 1.1.1
  prometheus 4.4.1 => 4.5.0
  tesla 1.3.0 => 1.3.2