Merge pull request #90 from olk/patch-8

Add Boost.Coroutine2 to .gitmodules

.gitmodules

@@ -398,6 +398,10 @@
 	path = libs/coroutine
 	url = ../coroutine.git
 	fetchRecurseSubmodules = on-demand
+[submodule "coroutine2"]
+	path = libs/coroutine2
+	url = ../coroutine2.git
+	fetchRecurseSubmodules = on-demand
 [submodule "ratio"]
 	path = libs/ratio
 	url = ../ratio.git