Bump ex_keccak from 0.1.2 to 0.1.3 (#40)

Bumps [ex_keccak](https://github.com/tzumby/ex_keccak) from 0.1.2 to 0.1.3.
- [Release notes](https://github.com/tzumby/ex_keccak/releases)
- [Changelog](https://github.com/tzumby/ex_keccak/blob/master/CHANGELOG.md)
- [Commits](ExWeb3/ex_keccak@v0.1.2...v0.1.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

mix.lock

@@ -6,7 +6,7 @@
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
   "ethereumex": {:hex, :ethereumex, "0.7.0", "6083ae91f6e4c886f935923751bfd4bcfc1d43ea969237a06a652df71fb4deb8", [:mix], [{:httpoison, "~> 1.7", [hex: :httpoison, repo: "hexpm", optional: false]}, {:jason, "~> 1.2", [hex: :jason, repo: "hexpm", optional: false]}, {:poolboy, "~> 1.5", [hex: :poolboy, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "0969d1f3ab2a8272acf6d0239edb6ee7ef8681366b7315a3d14381eae149cad2"},
   "ex_doc": {:hex, :ex_doc, "0.23.0", "a069bc9b0bf8efe323ecde8c0d62afc13d308b1fa3d228b65bca5cf8703a529d", [:mix], [{:earmark_parser, "~> 1.4.0", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm", "f5e2c4702468b2fd11b10d39416ddadd2fcdd173ba2a0285ebd92c39827a5a16"},
-  "ex_keccak": {:hex, :ex_keccak, "0.1.2", "4548914dc250a919712f03b4574fd2d048cd6d1245481b559abe9e7b9adafbd3", [:mix], [{:rustler, "~> 0.21.1", [hex: :rustler, repo: "hexpm", optional: false]}], "hexpm", "da2a11b1f95727193865f9184b6af9e1665e82b84f3c531ab4b7323532dafebd"},
+  "ex_keccak": {:hex, :ex_keccak, "0.1.3", "818faf6df706209782e7e0a8c16202e380a7a9b0e932e9fcb8fa3724f6e41d2e", [:mix], [{:rustler, "~> 0.21.1", [hex: :rustler, repo: "hexpm", optional: false]}], "hexpm", "10b3acd7c99624e52fd48dafb2d8b32063c7c5135cd98390974a41292b0601fe"},
   "ex_rlp": {:hex, :ex_rlp, "0.5.3", "9055bddade545ee3e734aaad62c4b4d08211834da3beb43ae269b75785909e5e", [:mix], [], "hexpm", "a755a5f8f9f66079f3ecbe021536b949077fac0df963d9e59a20321bab28722d"},
   "ex_secp256k1": {:hex, :ex_secp256k1, "0.1.2", "affe4e0fa1adc085ab47d7ab3cc44d594249d24bd0a37a9002f6648d112c2081", [:mix], [{:rustler, "~> 0.21.1 ", [hex: :rustler, repo: "hexpm", optional: false]}], "hexpm", "8ae0131380ada331b15924b563f89e7f56b4e74cc10978f3ea0836589e87730a"},
   "hackney": {:hex, :hackney, "1.17.0", "717ea195fd2f898d9fe9f1ce0afcc2621a41ecfe137fae57e7fe6e9484b9aa99", [:rebar3], [{:certifi, "~>2.5", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "~>6.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "~>1.0.0", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "~>3.3", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~>1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "64c22225f1ea8855f584720c0e5b3cd14095703af1c9fbc845ba042811dc671c"},