updated reqwest and fixed media route

reqwest updated to 0.8
removed Result for creating Mastodon client as result of reqwest update
added Meta and ImageDetails struct for Attachment
Changed Attachment.id to String
Added test for media route.
Changed paramaters for media from Vec<u8> of image data to String of
file path.
Added dotenv for testing

src/entities/attachment.rs

@@ -1,12 +1,29 @@
 #[derive(Debug, Clone, Deserialize)]
 pub struct Attachment {
-    pub id: u64,
+    pub id: String,
     #[serde(rename="type")]
     pub media_type: MediaType,
     pub url: String,
-    pub remote_url: String,
+    pub remote_url: Option<String>,
     pub preview_url: String,
     pub text_url: Option<String>,
+    pub meta: Option<Meta>,
+    pub description: Option<String>,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Meta {
+    original: ImageDetails,
+    small: ImageDetails,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct ImageDetails {
+    width: u64,
+    height: u64,
+    size: String,
+    aspect: f64,
+
 }
 
 #[derive(Debug, Deserialize, Clone, Copy)]