Updating cargo to latest

gilescope · gilescope · commit 49cf0c4a557c · 2017-06-22T00:50:06.000+01:00
diff --git a/src/tools/cargo b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 402d8454f86e514fa00e4f13f051f08620d6a9a7
+Subproject commit 534ce68621ce4feec0b7e8627cfd3b077d4f3900
