build(deps): bump tower from 0.6.1 to 0.6.4 (#56)

mix.lock

@@ -42,7 +42,7 @@
   "telemetry": {:hex, :telemetry, "1.3.0", "fedebbae410d715cf8e7062c96a1ef32ec22e764197f70cda73d82778d61e7a2", [:rebar3], [], "hexpm", "7015fc8919dbe63764f4b4b87a95b7c0996bd539e0d499be6ec9d7f3875b79e6"},
   "thousand_island": {:hex, :thousand_island, "1.3.5", "6022b6338f1635b3d32406ff98d68b843ba73b3aa95cfc27154223244f3a6ca5", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "2be6954916fdfe4756af3239fb6b6d75d0b8063b5df03ba76fd8a4c87849e180"},
   "tls_certificate_check": {:hex, :tls_certificate_check, "1.24.0", "d00e2887551ff8cdae4d0340d90d9fcbc4943c7b5f49d32ed4bc23aff4db9a44", [:rebar3], [{:ssl_verify_fun, "~> 1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm", "90b25a58ee433d91c17f036d4d354bf8859a089bfda60e68a86f8eecae45ef1b"},
-  "tower": {:hex, :tower, "0.6.1", "837528725ccf001bd69393039025063024b96b08fef956725e79629a926e5ddf", [:mix], [{:telemetry, "~> 1.1", [hex: :telemetry, repo: "hexpm", optional: false]}, {:uniq, "~> 0.6.0", [hex: :uniq, repo: "hexpm", optional: false]}], "hexpm", "335f94bb53fa36db8f2178c2daa05dc556c0498a51076b6321ba2b72d67274b8"},
+  "tower": {:hex, :tower, "0.6.4", "03a003619520d666d356056a343f62d5a3ca5cdda9e7105420c464b571bd85b4", [:mix], [{:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: true]}, {:telemetry, "~> 1.1", [hex: :telemetry, repo: "hexpm", optional: false]}, {:uniq, "~> 0.6.0", [hex: :uniq, repo: "hexpm", optional: false]}], "hexpm", "b295e34081c2b5764ca8c5d2ad60e10302abad8fce6f860e3d742e87a4afd041"},
   "tower_email": {:hex, :tower_email, "0.5.1", "dc34262df27c3c21adf41760049e9cc9eb7848d73f565ec51f61b0bba7072cad", [:mix], [{:hackney, "~> 1.20", [hex: :hackney, repo: "hexpm", optional: true]}, {:swoosh, "~> 1.14", [hex: :swoosh, repo: "hexpm", optional: false]}, {:tower, "~> 0.6.0", [hex: :tower, repo: "hexpm", optional: false]}], "hexpm", "de1880988871966c81ed3e7a5dadcc5559b79cb5a1dbc52b17c7a7253f511594"},
   "uniq": {:hex, :uniq, "0.6.1", "369660ecbc19051be526df3aa85dc393af5f61f45209bce2fa6d7adb051ae03c", [:mix], [{:ecto, "~> 3.0", [hex: :ecto, repo: "hexpm", optional: true]}], "hexpm", "6426c34d677054b3056947125b22e0daafd10367b85f349e24ac60f44effb916"},
   "websock": {:hex, :websock, "0.5.3", "2f69a6ebe810328555b6fe5c831a851f485e303a7c8ce6c5f675abeb20ebdadc", [:mix], [], "hexpm", "6105453d7fac22c712ad66fab1d45abdf049868f253cf719b625151460b8b453"},