bump libbson to 1.4.2

ajdavis · ajdavis · commit 985222674556 · 2016-09-30T16:03:31.000-04:00
diff --git a/src/libbson b/src/libbson
@@ -1 +1 @@
-Subproject commit 693c7c700b981dffee32a9183cd2359896718c20
+Subproject commit c02383a1fe0ad10e7d638a7f07d90de7292bf616
