Updates version number to 0.4.269873219.20190918.

Significant changes:
- Generated xcodeprojs now default to gnu++17 for indexing.

PiperOrigin-RevId: 269878500
diff --git a/version.bzl b/version.bzl
index af96bc5..d087c74 100644
--- a/version.bzl
+++ b/version.bzl
@@ -4,9 +4,9 @@
 # Version number (recorded into the Info.plist)
 TULSI_VERSION_MAJOR = "0"
 
-TULSI_VERSION_FIXLEVEL = "268715767"
+TULSI_VERSION_FIXLEVEL = "269873219"
 
-TULSI_VERSION_DATE = "20190912"
+TULSI_VERSION_DATE = "20190918"
 
 TULSI_VERSION_COPYRIGHT = "2015-2018"