Updates version number to 0.4.221678280.20181115.

Significant changes:
- Improved module map support.

PiperOrigin-RevId: 221682544
diff --git a/version.bzl b/version.bzl
index d34946c..b0ce9c9 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 = "219536351"
+TULSI_VERSION_FIXLEVEL = "221678280"
 
-TULSI_VERSION_DATE = "20181031"
+TULSI_VERSION_DATE = "20181115"
 
 TULSI_VERSION_COPYRIGHT = "2015-2018"