chore: fix flow config

nodkz · nodkz · commit 26c7e12816db · 2020-02-16T03:04:27.000+06:00
diff --git a/.flowconfig b/.flowconfig
@@ -42,4 +42,5 @@
 
 [options]
 esproposal.class_instance_fields=enable
+esproposal.optional_chaining=enable
 suppress_comment= \\(.\\|\n\\)*\\$FlowFixMe
