Add await-expr.md to SUMMARY

ehuss · ehuss · commit 6ba1ab2baa0e · 2019-07-16T15:07:01.000-07:00
diff --git a/src/SUMMARY.md b/src/SUMMARY.md
@@ -67,6 +67,7 @@
         - [If and if let expressions](expressions/if-expr.md)
         - [Match expressions](expressions/match-expr.md)
         - [Return expressions](expressions/return-expr.md)
+        - [Await expressions](expressions/await-expr.md)
 
 - [Patterns](patterns.md)
 
