Get pre-built from https://unofficial-builds.nodejs.org (only provides x64)

diff --git a/src/config.rs b/src/config.rs
index df65675..6e2dba9 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -11,7 +11,7 @@ pub struct FnmConfig {
     #[clap(
         long,
         env = "FNM_NODE_DIST_MIRROR",
-        default_value = "https://nodejs.org/dist",
+        default_value = "https://unofficial-builds.nodejs.org/download/release",
         global = true,
         hide_env_values = true
     )]
@@ -95,7 +95,7 @@ pub struct FnmConfig {
 impl Default for FnmConfig {
     fn default() -> Self {
         Self {
-            node_dist_mirror: Url::parse("https://nodejs.org/dist/").unwrap(),
+            node_dist_mirror: Url::parse("https://unofficial-builds.nodejs.org/download/release").unwrap(),
             base_dir: None,
             multishell_path: None,
             log_level: LogLevel::Info,
diff --git a/src/downloader.rs b/src/downloader.rs
index a020f57..bcd98c6 100644
--- a/src/downloader.rs
+++ b/src/downloader.rs
@@ -178,7 +178,7 @@ mod tests {
     fn install_in(path: &Path) -> PathBuf {
         let version = Version::parse("12.0.0").unwrap();
         let arch = Arch::X64;
-        let node_dist_mirror = Url::parse("https://nodejs.org/dist/").unwrap();
+        let node_dist_mirror = Url::parse("https://unofficial-builds.nodejs.org/download/release").unwrap();
         install_node_dist(&version, &node_dist_mirror, path, &arch, false)
             .expect("Can't install Node 12");