[completion] Update submodule to version 0.29.0

ericbn · ericbn · commit c50a0153d22a · 2018-11-26T21:33:30.000-05:00
diff --git a/modules/completion/external b/modules/completion/external
@@ -1 +1 @@
-Subproject commit 955645c22b29434caefadcb7d541d570d40ae932
+Subproject commit 8ec8c8c5c662c3cb77231b7458ce1975d2f8c967
