Fix file read for old path (#42)

Fixes #41.

Author: rikhuijzer

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "ata"
-version = "2.0.3"
+version = "2.0.4"
 edition = "2021"
 authors = ["The ATA Developers"]
 license = "MIT"

ata/Cargo.toml

@@ -83,6 +83,11 @@ fn main() -> prompt::TokioResult<()> {
     if !old_filename.exists() && !filename.exists() {
         help::missing_toml(args);
     }
+    let filename = if old_filename.exists() {
+        old_filename
+    } else {
+        filename
+    };
     let mut contents = String::new();
     File::open(filename)
         .unwrap()