Fix: incorrect field names for Attachment

I think I got the names from the Go source code, but the API emits JSON
that has these names instead. The api/swagger guide even says as much.

This caused the super fun quirk that the upload actually succeedes, but
the program reports an error condition because of the deserialization
failure. Time to bump a minor revision!

src/api/release_attachment.rs

@@ -1,4 +1,4 @@
-use std::fs;
+use std::{fs, path};
 
 use crate::structs::Attachment;
 
@@ -16,7 +16,8 @@ pub async fn create_release_attachment(
 ) -> crate::Result<Attachment> {
     let request_url = format!("{gitea_url}/api/v1/repos/{repo}/releases/{release_id}/assets");
 
-    match fs::exists(&file) {
+    let path = path::Path::new(&file);
+    match path.try_exists() {
         Ok(true) => (),
         Ok(false) => return Err(crate::Error::NoSuchFile),
         Err(e) => {

src/main.rs

@@ -1,4 +1,5 @@
-use std::fs;
+
+use std::path;
 
 use gt_tool::cli::Args;
 use gt_tool::structs::release::{CreateReleaseOption, Release};
@@ -81,7 +82,8 @@ async fn main() -> Result<(), gt_tool::Error> {
 
             if let Some(release) = match_release_by_tag(&tag_name, release_candidates) {
                 for file in &files {
-                    match fs::exists(file) {
+                    let path = path::Path::new(&file);
+                    match path.try_exists() {
                         Ok(true) => continue,
                         Ok(false) => return Err(gt_tool::Error::NoSuchFile),
                         Err(e) => {

src/structs/mod.rs

@@ -9,7 +9,7 @@ pub struct Attachment {
     name: String,
     size: i64,
     download_count: i64,
-    created: String, // TODO: Date-time struct
+    created_at: String, // TODO: Date-time struct
     uuid: String,
-    download_url: String,
+    browser_download_url: String,
 }