Merge pull request #82 from lioncash/catch

externals: Update catch to 2.1.0

externals/catch

@@ -1 +1 @@
-Subproject commit 3dcc9233515ea69e45a11be369f867a944e72e76
+Subproject commit cd76f5730c9a3afa19f3b9c83608d9c7ab325a19