Fixes #7: Use xz files instead of gz (#17)

executable/Install.re

@@ -44,7 +44,10 @@ let main = (~version as versionName) => {
   let%lwt filepath =
     Versions.getFileToDownload(~version=versionName, ~os, ~arch);
   let tarDestination =
-    Filename.concat(Directories.downloads, versionName ++ ".tar.gz");
+    Filename.concat(
+      Directories.downloads,
+      versionName ++ Versions.Remote.downloadFileSuffix,
+    );
 
   Console.log(
     <Pastel>

library/Versions.re

@@ -43,7 +43,7 @@ module Remote = {
     |> List.map(Soup.attribute("href"))
     |> Core.List.filter_map(~f=x => x);
 
-  let downloadFileSuffix = ".tar.gz";
+  let downloadFileSuffix = ".tar.xz";
 
   let getVersionFromFilename = filename => {
     let strings = filename |> String.split_on_char('-');