Upgrade httpoison and hackney to fix SSL issue

This is the issue that is fixed
benoitc/hackney#591

mix.exs

@@ -29,7 +29,7 @@ defmodule Pomodoro.MixProject do
       # dep(:cortex, :path),
       {:dialyxir, "~> 1.0.0-rc.6", only: [:dev, :test], runtime: false},
       {:jason, "~> 1.1"},
-      {:httpoison, "~> 1.5"},
+      {:httpoison, "~> 1.6"},
       {:launcher, github: "axelson/scenic_launcher"},
       {:sched_ex, "~> 1.1"},
       dep(:scenic, :hex),

mix.lock

@@ -11,8 +11,8 @@
   "file_system": {:hex, :file_system, "0.2.7", "e6f7f155970975789f26e77b8b8d8ab084c59844d8ecfaf58cbda31c494d14aa", [:mix], []},
   "font_metrics": {:hex, :font_metrics, "0.3.1", "025ff9957040eb4d6430c306a4445bad5d9f43ec24448c1647df7cb63b5dd88c", [:mix], [{:msgpax, "~> 2.2", [hex: :msgpax, optional: false]}]},
   "gettext": {:hex, :gettext, "0.17.0", "abe21542c831887a2b16f4c94556db9c421ab301aee417b7c4fbde7fbdbe01ec", [:mix], []},
-  "hackney": {:hex, :hackney, "1.15.1", "9f8f471c844b8ce395f7b6d8398139e26ddca9ebc171a8b91342ee15a19963f4", [:rebar3], [{:certifi, "2.5.1", [hex: :certifi, optional: false]}, {:idna, "6.0.0", [hex: :idna, optional: false]}, {:metrics, "1.0.1", [hex: :metrics, optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, optional: false]}, {:ssl_verify_fun, "1.1.4", [hex: :ssl_verify_fun, optional: false]}]},
-  "httpoison": {:hex, :httpoison, "1.5.1", "0f55b5b673b03c5c327dac7015a67cb571b99b631acc0bc1b0b98dcd6b9f2104", [:mix], [{:hackney, "~> 1.8", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm"},
+  "hackney": {:hex, :hackney, "1.15.2", "07e33c794f8f8964ee86cebec1a8ed88db5070e52e904b8f12209773c1036085", [:rebar3], [{:certifi, "2.5.1", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "6.0.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.5", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
+  "httpoison": {:hex, :httpoison, "1.6.2", "ace7c8d3a361cebccbed19c283c349b3d26991eff73a1eaaa8abae2e3c8089b6", [:mix], [{:hackney, "~> 1.15 and >= 1.15.2", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm"},
   "idna": {:hex, :idna, "6.0.0", "689c46cbcdf3524c44d5f3dde8001f364cd7608a99556d8fbd8239a5798d4c10", [:rebar3], [{:unicode_util_compat, "0.4.1", [hex: :unicode_util_compat, optional: false]}]},
   "jason": {:hex, :jason, "1.1.2", "b03dedea67a99223a2eaf9f1264ce37154564de899fd3d8b9a21b1a6fd64afe7", [:mix], [{:decimal, "~> 1.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm"},
   "launcher": {:git, "https://github.com/axelson/scenic_launcher.git", "49e32b9e94efe4be86bd1f5e2c4e8c861abea380", []},
@@ -26,7 +26,7 @@
   "scenic_live_reload": {:hex, :scenic_live_reload, "0.1.0", "ba07981609db9296bbbcc5e4dd2dd2d41865d0ce66361f56de446ec0d369aaf2", [:mix], [{:exsync, "~> 0.2", [hex: :exsync, repo: "hexpm", optional: false]}, {:scenic, "~> 0.10", [hex: :scenic, repo: "hexpm", optional: false]}], "hexpm"},
   "sched_ex": {:hex, :sched_ex, "1.1.1", "e2e8e136ae0a8c19d882031a528b4ea98c55fe88da74e948836bde22c90dcfc4", [:mix], [{:crontab, "~> 1.1.2", [hex: :crontab, optional: false]}, {:timex, "~> 3.1", [hex: :timex, optional: false]}]},
   "slack": {:hex, :slack, "0.19.0", "900fa5f7a22cd1b736c29beed63eb445d7e637ce23c844890c8964e431a02b51", [:mix], [{:httpoison, "~> 1.2", [hex: :httpoison, repo: "hexpm", optional: false]}, {:poison, "~> 3.0", [hex: :poison, repo: "hexpm", optional: false]}, {:websocket_client, "~> 1.2.4", [hex: :websocket_client, repo: "hexpm", optional: false]}], "hexpm"},
-  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.4", "f0eafff810d2041e93f915ef59899c923f4568f4585904d010387ed74988e77b", [:make, :mix, :rebar3], []},
+  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.5", "6eaf7ad16cb568bb01753dbbd7a95ff8b91c7979482b95f38443fe2c8852a79b", [:make, :mix, :rebar3], [], "hexpm"},
   "timex": {:hex, :timex, "3.6.1", "efdf56d0e67a6b956cc57774353b0329c8ab7726766a11547e529357ffdc1d56", [:mix], [{:combine, "~> 0.10", [hex: :combine, optional: false]}, {:gettext, "~> 0.10", [hex: :gettext, optional: false]}, {:tzdata, "~> 0.1.8 or ~> 0.5 or ~> 1.0.0", [hex: :tzdata, optional: false]}]},
   "tzdata": {:hex, :tzdata, "1.0.1", "f6027a331af7d837471248e62733c6ebee86a72e57c613aa071ebb1f750fc71a", [:mix], [{:hackney, "~> 1.0", [hex: :hackney, optional: false]}]},
   "unicode_util_compat": {:hex, :unicode_util_compat, "0.4.1", "d869e4c68901dd9531385bb0c8c40444ebf624e60b6962d95952775cac5e90cd", [:rebar3], []},