Add Jest-generated coverage files to gitignore

.gitignore

@@ -1,6 +1,7 @@
 .DS_Store
 node_modules
 /dist
+coverage
 
 # local env files
 .env.local

src/network/Client.ts

@@ -38,6 +38,16 @@ export abstract class Client extends EventEmitter {
         this.players.push(data.name);
         this.emit("player-joined", data.name);
         break;
+      case "player-left":
+        let idx = this.players.indexOf(data.name);
+        if (idx < 0) {
+          // Weird
+          console.warn(
+            `Someone (${data.name}) left but wasn't on the player list`
+          );
+          break;
+        }
+        this.players.splice(idx, 1);
       default:
         // For most cases, we can just use the kind as event type
         this.emit(data.kind, data);