Add CHANGELOG entry

CHANGELOG.md

@@ -20,6 +20,7 @@
 - [#3178](https://github.com/poanetwork/blockscout/pull/3178) - Fix unavailable navbar menu when read/write proxy tab is active
 
 ### Chore
+- [#3210](https://github.com/poanetwork/blockscout/pull/3210) - Update Phoenix up to 1.4.17
 - [#3206](https://github.com/poanetwork/blockscout/pull/3206) - Update Elixir version: 1.10.2 -> 1.10.3
 - [#3204](https://github.com/poanetwork/blockscout/pull/3204) - GraphQL Absinthe related packages update up to stable versions
 - [#3180](https://github.com/poanetwork/blockscout/pull/3180) - Return correct status in verify API endpoint if contract verified

mix.exs

@@ -72,12 +72,6 @@ defmodule BlockScout.Mixfile do
   # and cannot be accessed from applications inside the apps folder
   defp deps do
     [
-      {:db_connection, "~> 2.2.2"},
-      {:phoenix, "~> 1.4"},
-      {:ecto, "~> 3.3.4"},
-      {:phoenix_ecto, "~> 4.1"},
-      {:phoenix_live_reload, "~> 1.2"},
-      {:ecto_sql, "~> 3.3"},
       # Documentation
       {:ex_doc, "~> 0.19.0", only: [:dev]},
       # Code coverage