Use env!("CARGO_PKG_VERSION") instead of hardcoding version when possible

See https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-crates

plume-cli/src/main.rs

@@ -15,7 +15,7 @@ mod users;
 fn main() {
     let mut app = App::new("Plume CLI")
         .bin_name("plm")
-        .version("0.2.0")
+        .version(env!("CARGO_PKG_VERSION"))
         .about("Collection of tools to manage your Plume instance.")
         .subcommand(instance::command())
         .subcommand(users::command());

plume-common/src/activity_pub/request.rs

@@ -9,7 +9,7 @@ use std::time::SystemTime;
 use activity_pub::ap_accept_header;
 use activity_pub::sign::Signer;
 
-const USER_AGENT: &'static str = "Plume/0.2.0";
+const USER_AGENT: &'static str = concat!("Plume/", env!("CARGO_PKG_VERSION"));
 
 header! {
     (Signature, "Signature") => [String]

src/routes/instance.rs

@@ -219,7 +219,7 @@ fn nodeinfo(conn: DbConn) -> Json<serde_json::Value> {
         "version": "2.0",
         "software": {
             "name": "Plume",
-            "version": "0.2.0"
+            "version": env!("CARGO_PKG_VERSION")
         },
         "protocols": ["activitypub"],
         "services": {
@@ -244,7 +244,7 @@ fn about(user: Option<User>, conn: DbConn) -> Template {
         "account": user.map(|u| u.to_json(&*conn)),
         "instance": Instance::get_local(&*conn),
         "admin": Instance::get_local(&*conn).map(|i| i.main_admin(&*conn).to_json(&*conn)),
-        "version": "0.2.0",
+        "version": env!("CARGO_PKG_VERSION"),
         "n_users": User::count_local(&*conn),
         "n_articles": Post::count_local(&*conn),
         "n_instances": Instance::count(&*conn) - 1