host player shows session

Author: jeongY-Cho

src/components/HostPlayer/index.jsx

@@ -208,7 +208,7 @@ class HostPlayer extends React.Component {
       <Layout noBackground>
         <div className={styles.container}>
           <div className={styles.titleBar}>
-            <h1>Session</h1>
+            <h1>Session: {this.props.sessionId}</h1>
             <div className={styles.linkWrapper}>
               <div className={styles.shareExplanations}>
                 Share the URL below to listen with others: