improve the FCP completion message. (#256)

Author: Centril

src/github/nag.rs

@@ -1186,13 +1186,20 @@ impl<'a> RfcBotComment<'a> {
                 Self::add_comment_url(issue, &mut msg, status_comment_id);
                 msg.push_str("), is now **complete**.");
 
+                msg.push_str("\n\nAs the automated representative of the governance process,\
+                              I would like to thank @");
+                msg.push_str(&author.login);
+                msg.push_str("for their work and everyone else who contributed.");
+
                 match disposition {
-                    FcpDisposition::Merge => {}
+                    FcpDisposition::Merge => {
+                        msg.push_str("\n\nThe RFC will be merged soon.");
+                    }
                     FcpDisposition::Close if can_ffcp_close(issue) => {
-                        msg.push_str("\n\nBy the power vested in me by Rust, I hereby close this RFC.");
+                        msg.push_str("\n\nThe RFC is now closed.");
                     },
                     FcpDisposition::Postpone if can_ffcp_postpone(issue) => {
-                        msg.push_str("\n\nBy the power vested in me by Rust, I hereby postpone this RFC.");
+                        msg.push_str("\n\nThe RFC is now postponed.");
                     },
                     _ => {},
                 }