fix part numbers starting with 0

Cargo.lock

@@ -3392,7 +3392,7 @@ dependencies = [
 
 [[package]]
 name = "twba-uploader"
-version = "0.2.0"
+version = "0.2.1"
 dependencies = [
  "anyhow",
  "chrono",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "twba-uploader"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/client.rs

@@ -244,7 +244,7 @@ fn get_part_number_from_path(path: &Path) -> Result<usize> {
                 let part_number = part_number
                     .parse::<usize>()
                     .context("could not parse path")?;
-                return Ok(part_number);
+                return Ok(part_number + 1);
             }
             warn!("path has not the expected extension (.mp4): {:?}", path);
         }