Add ability to specify address in default.project.json (#507)

* Allow for setting the default port in project json

set as
```json
"serveAddress": "0.0.0.0"
```

* Update CHANGELOG.md

* cargo fmt

Co-authored-by: Lucien Greathouse <me@lpghatguy.com>

src/serve_session.rs

@@ -2,6 +2,7 @@ use std::{
     borrow::Cow,
     collections::HashSet,
     io,
+    net::IpAddr,
     path::{Path, PathBuf},
     sync::{Arc, Mutex, MutexGuard},
     time::Instant,
@@ -212,6 +213,10 @@ impl ServeSession {
     pub fn serve_place_ids(&self) -> Option<&HashSet<u64>> {
         self.root_project.serve_place_ids.as_ref()
     }
+
+    pub fn serve_address(&self) -> Option<IpAddr> {
+        self.root_project.serve_address
+    }
 }
 
 #[derive(Debug, Error)]