elixir: 1.6.0 -> 1.6.2

pkgs/development/interpreters/elixir/1.6.nix

···
 { mkDerivation }:
 
 mkDerivation rec {
-  version = "1.6.0";
-  sha256 = "0wfmbrq70n85mx17kl9h2k0xzgnhncz3xygjx9cbvpmiwwdzgrdx";
+  version = "1.6.2";
+  sha256 = "18f5afmvra78y0x73bfnwbddlyqfndyaj1h8n1ybj32w4nvy96y7";
   minimumOTPVersion = "18";
 }