update libring to fix issue with otp-27

otherwise the libring distribution is broken, see elixir-horde/horde#275 (comment)

fixed by libring PR 37

Author: flaviogrossi

mix.lock

@@ -8,7 +8,7 @@
   "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},
   "global_flags": {:hex, :global_flags, "1.0.0", "ee6b864979a1fb38d1fbc67838565644baf632212bce864adca21042df036433", [:rebar3], [], "hexpm", "85d944cecd0f8f96b20ce70b5b16ebccedfcd25e744376b131e89ce61ba93176"},
   "jason": {:hex, :jason, "1.4.1", "af1504e35f629ddcdd6addb3513c3853991f694921b1b9368b0bd32beb9f1b63", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "fbb01ecdfd565b56261302f7e1fcc27c4fb8f32d56eab74db621fc154604a7a1"},
-  "libring": {:hex, :libring, "1.6.0", "d5dca4bcb1765f862ab59f175b403e356dec493f565670e0bacc4b35e109ce0d", [:mix], [], "hexpm", "5e91ece396af4bce99953d49ee0b02f698cd38326d93cd068361038167484319"},
+  "libring": {:hex, :libring, "1.7.0", "4f245d2f1476cd7ed8f03740f6431acba815401e40299208c7f5c640e1883bda", [:mix], [], "hexpm", "070e3593cb572e04f2c8470dd0c119bc1817a7a0a7f88229f43cf0345268ec42"},
   "local_cluster": {:hex, :local_cluster, "1.2.1", "8eab3b8a387680f0872eacfb1a8bd5a91cb1d4d61256eec6a655b07ac7030c73", [:mix], [{:global_flags, "~> 1.0", [hex: :global_flags, repo: "hexpm", optional: false]}], "hexpm", "aae80c9bc92c911cb0be085fdeea2a9f5b88f81b6bec2ff1fec244bb0acc232c"},
   "makeup": {:hex, :makeup, "1.1.1", "fa0bc768698053b2b3869fa8a62616501ff9d11a562f3ce39580d60860c3a55e", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "5dc62fbdd0de44de194898b6710692490be74baa02d9d108bc29f007783b0b48"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.1", "cc9e3ca312f1cfeccc572b37a09980287e243648108384b97ff2b76e505c3555", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "e127a341ad1b209bd80f7bd1620a15693a9908ed780c3b763bccf7d200c767c6"},