updates coherence to tag v0.5.2

updates in tag v0.5.2 :
1. downcasing password reset and unlocking email as well.
2. trimming email address for logging, password reset and unlocking

mix.exs

@@ -49,7 +49,7 @@ defmodule CoursePlanner.Mixfile do
      {:gettext, "~> 0.11"},
      {:cowboy, "~> 1.0"},
      {:swoosh, "~> 0.7.0"},
-     {:coherence, github: "ghatighorias/coherence", tag: "v0.5.1"},
+     {:coherence, github: "ghatighorias/coherence", tag: "v0.5.2"},
      {:canada, "~> 1.0.1"},
      {:canary, github: "cpjk/canary"},
      {:distillery, "~> 1.0.0"},

mix.lock

@@ -2,7 +2,7 @@
   "canada": {:hex, :canada, "1.0.1", "da96d0ff101a0c2a6cc7b07d92b8884ff6508f058781d3679999416feacf41c5", [:mix], [], "hexpm"},
   "canary": {:git, "https://github.com/cpjk/canary.git", "a4159160d39a208ffd396011cbf34599285ef797", []},
   "certifi": {:hex, :certifi, "2.0.0", "a0c0e475107135f76b8c1d5bc7efb33cd3815cb3cf3dea7aefdd174dabead064", [:rebar3], [], "hexpm"},
-  "coherence": {:git, "https://github.com/ghatighorias/coherence.git", "e39282e5edf7fcf835cae9b667052dd7b5696cfe", [tag: "v0.5.1"]},
+  "coherence": {:git, "https://github.com/ghatighorias/coherence.git", "2949f81c92cba70174364c721eaa6e138b8ef60b", [tag: "v0.5.2"]},
   "combine": {:hex, :combine, "0.10.0", "eff8224eeb56498a2af13011d142c5e7997a80c8f5b97c499f84c841032e429f", [:mix], [], "hexpm"},
   "comeonin": {:hex, :comeonin, "3.2.0", "cb10995a22aed6812667efb3856f548818c85d85394d8132bc116fbd6995c1ef", [:make, :mix], [{:elixir_make, "~> 0.4", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm"},
   "connection": {:hex, :connection, "1.0.4", "a1cae72211f0eef17705aaededacac3eb30e6625b04a6117c1b2db6ace7d5976", [:mix], [], "hexpm"},