Bump excoveralls from 0.10.5 to 0.10.6 (#339)

Bumps [excoveralls](https://github.com/parroty/excoveralls) from 0.10.5 to 0.10.6.
- [Release notes](https://github.com/parroty/excoveralls/releases)
- [Changelog](https://github.com/parroty/excoveralls/blob/master/CHANGELOG.md)
- [Commits](parroty/excoveralls@v0.10.5...v0.10.6)

Signed-off-by: dependabot[bot] <[email protected]>

mix.lock

@@ -29,7 +29,7 @@
   "elixir_uuid": {:hex, :elixir_uuid, "1.2.0", "ff26e938f95830b1db152cb6e594d711c10c02c6391236900ddd070a6b01271d", [:mix], [], "hexpm"},
   "ex_chimp": {:hex, :ex_chimp, "0.0.3", "fc854058ca8c47abf3e445639f58ace1f22aa641d07d5f2e014f103d89dc3360", [:mix], [{:httpoison, "~> 0.10 or ~> 1.1", [hex: :httpoison, repo: "hexpm", optional: false]}, {:poison, "~> 1.5 or ~> 2.0 or ~> 3.1", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
   "ex_machina": {:hex, :ex_machina, "2.3.0", "92a5ad0a8b10ea6314b876a99c8c9e3f25f4dde71a2a835845b136b9adaf199a", [:mix], [{:ecto, "~> 2.2 or ~> 3.0", [hex: :ecto, repo: "hexpm", optional: true]}, {:ecto_sql, "~> 3.0", [hex: :ecto_sql, repo: "hexpm", optional: true]}], "hexpm"},
-  "excoveralls": {:hex, :excoveralls, "0.10.5", "7c912c4ec0715a6013647d835c87cde8154855b9b84e256bc7a63858d5f284e3", [:mix], [{:hackney, "~> 1.13", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm"},
+  "excoveralls": {:hex, :excoveralls, "0.10.6", "e2b9718c9d8e3ef90bc22278c3f76c850a9f9116faf4ebe9678063310742edc2", [:mix], [{:hackney, "~> 1.13", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm"},
   "exgravatar": {:hex, :exgravatar, "2.0.1", "66d595c7d63dd6bbac442c5542a724375ae29144059c6fe093e61553850aace4", [:mix], [], "hexpm"},
   "exjsx": {:hex, :exjsx, "4.0.0", "60548841e0212df401e38e63c0078ec57b33e7ea49b032c796ccad8cde794b5c", [:mix], [{:jsx, "~> 2.8.0", [hex: :jsx, repo: "hexpm", optional: false]}], "hexpm"},
   "exprotobuf": {:hex, :exprotobuf, "1.2.9", "f3cac1b0d0444da3c72cdfe80e394d721275dc80b1d7703ead9dad9267e93822", [:mix], [{:gpb, "~> 3.24", [hex: :gpb, repo: "hexpm", optional: false]}], "hexpm"},