config bugfix, i2c dependency

sensor_hub/config/target.exs

@@ -60,6 +60,7 @@ config :vintage_net,
        ipv4: %{method: :dhcp}
      }},
     {"wlan0", %{type: VintageNetWiFi}
+     }
   ]
 
 config :mdns_lite,
@@ -95,5 +96,5 @@ config :mdns_lite,
 # of this file so it overrides the configuration defined above.
 # Uncomment to use target specific configurations
 
-import_config target.secret.exs
+import_config "target.secret.exs"
 # import_config "#{Mix.target()}.exs"

sensor_hub/mix.exs

@@ -34,6 +34,7 @@ defmodule SensorHub.MixProject do
       {:shoehorn, "~> 0.7.0"},
       {:ring_logger, "~> 0.8.1"},
       {:toolshed, "~> 0.2.13"},
+      {:circuits_i2c, "~> 1.0"},
 
       {:nerves_runtime, "~> 0.11.3", targets: @all_targets},
       {:nerves_pack, "~> 0.6.0", targets: @all_targets},

sensor_hub/mix.lock

@@ -1,5 +1,6 @@
 %{
   "beam_notify": {:hex, :beam_notify, "1.0.0", "5b8dceed76f8ac4acadf4d2915ac85b98c42bb17d7dd58253c7593d2a0deedbd", [:make, :mix], [{:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "a80331f6c3596918affa408d91ed634106b7ae71b3fc589432363aca68378362"},
+  "circuits_i2c": {:hex, :circuits_i2c, "1.0.0", "0b9c686ff5075f9364209fef62f6b5162eeb41a0061571f52f02637b40ca37fe", [:make, :mix], [{:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "f80efc49235e7819b9ea8e82c7dbd5e2523c65d8e3d4f46f89dfd43217a3f4f7"},
   "circular_buffer": {:hex, :circular_buffer, "0.4.0", "a51ea76bb03c4a38207934264bcc600018ead966728ca80da731458c5f940f8b", [:mix], [], "hexpm", "c604b19f2101982b63264e2ed90c6fb0fe502540b6af83ce95135ac9b6f2d847"},
   "elixir_make": {:hex, :elixir_make, "0.6.3", "bc07d53221216838d79e03a8019d0839786703129599e9619f4ab74c8c096eac", [:mix], [], "hexpm", "f5cbd651c5678bcaabdbb7857658ee106b12509cd976c2c2fca99688e1daf716"},
   "gen_state_machine": {:hex, :gen_state_machine, "3.0.0", "1e57f86a494e5c6b14137ebef26a7eb342b3b0070c7135f2d6768ed3f6b6cdff", [:mix], [], "hexpm", "0a59652574bebceb7309f6b749d2a41b45fdeda8dbb4da0791e355dd19f0ed15"},