Fix reference to ev3dev-lang submodule

ddemidov · ddemidov · commit 2e34cda4ed2e · 2017-02-13T17:04:47.000+03:00
diff --git a/ev3dev-lang b/ev3dev-lang
@@ -1 +1 @@
-Subproject commit 3f61b1dd73f996a47de0856ecd3826ebbd8f88b9
+Subproject commit 7d4a74d80f30009e17c4074690c01b52872b9cd3
