Downgrade precompiled to Erlang 18

Author: José Valim

elixir.csv

@@ -1,5 +1,5 @@
 version,url_precompiled,release_type,windows_installer_compat,sha1,sha512
-1.5.2,https://github.com/elixir-lang/elixir/releases/download/v1.5.2/Precompiled.zip,release,1,54e7aae275fbe6f2af9355d271544adfe9301360,df2c8a4d7c2cab533cc21a42dc7ca2bd6d3956179038791d69cf6d950f643ccd0e0ca58d5de9fb4c480cdae96451c7a0cc8baeb35cc0fe690cf76422908abf71
+1.5.2,https://github.com/elixir-lang/elixir/releases/download/v1.5.2/Precompiled.zip,release,1,d5e900d3a06d773a070404f51e6c7eb7882f2af8,44bf503bd369e24bb1f07f918c84ea53b0084bf126cba7492a339a6d1390a316f66394f91fc784e57d7e88f84f2e51656f00116921f6ba106bfbe135f5d8ae42
 1.5.1,https://github.com/elixir-lang/elixir/releases/download/v1.5.1/Precompiled.zip,release,1,29cfd5a8752e37ea50497d69ed5d16327738b470,291cf747344a274fb76b3f7676a1496cdad99ab6aeebe7ba38fac067b01f1b4b807c3644d8caa43ae55fda19923447605b30eb851d2ad6e8b08b9464a7303b87
 1.5.0,https://github.com/elixir-lang/elixir/releases/download/v1.5.0/Precompiled.zip,release,1,4503565a66977f61f9de255a2158b3d589433445,51b39b3214cf0fc78fb867086885df3ad79e9b204480e5c8f5b5a1105632df29a5a5a2cecc610f3093ce4eed6cce8d30f43e480978edb5f7ffafa2b6307a1da8
 1.4.5,https://github.com/elixir-lang/elixir/releases/download/v1.4.5/Precompiled.zip,release,1,254f4b6731a618c5f56a1c51ae759f6e2fd7677e,29b2035a2128fa273ddf13d19555b72b12d05cd0016524a03d1f2fc0d29d3cccb8fdfbf968529098ed1f8d9a41e2a6ca9638192009df2eb7cefe14d4effc78b4