Add parsing of the URL to view the pull request.

src/githubctl/pull_request_event.rs

@@ -4,6 +4,7 @@ use crate::json_util::get_json_string;
 pub struct PullRequestEvent<'a> {
     original_event: &'a serde_json::Value,
     pub action: &'a String,
+    pub html_url: &'a String,
 }
 
 impl<'a> PullRequestEvent<'a> {
@@ -12,14 +13,23 @@ impl<'a> PullRequestEvent<'a> {
             .get("payload")
             .map(get_json_object)
             .expect("Ran into a PullRequestEvent without a payload.");
-        let action = payload
+        let payload_action = payload
             .get("action")
             .map(get_json_string)
             .expect("Ran into a PullRequestEvent without a payload.action.");
+        let payload_pull_request = payload
+            .get("pull_request")
+            .map(get_json_object)
+            .expect("Ran into a PullRequestEvent without a payload.pull_request.");
+        let payload_pull_request_html_url = payload_pull_request
+            .get("html_url")
+            .map(get_json_string)
+            .expect("Ran into a PullRequestEvent without a payload.pull_request.html_url.");
 
         Ok(PullRequestEvent {
             original_event,
-            action,
+            action: payload_action,
+            html_url: payload_pull_request_html_url,
         })
     }