Remove snag dependency

dev/spacetraders_sdk_dev.gleam

@@ -1,6 +1,4 @@
-import gleam/io
 import oas/generator
-import snag
 
 pub fn main() {
   case
@@ -12,6 +10,9 @@ pub fn main() {
     )
   {
     Ok(_) -> Nil
-    Error(reason) -> io.print(snag.pretty_print(reason))
+    Error(reason) -> {
+      echo reason
+      Nil
+    }
   }
 }