update examples so they can compile again, and make them visible to dub

examples/constructor/dub.json

@@ -5,6 +5,6 @@
     "mainSourceFile": "main.d",
     "dependencies":
     {
-        "dyaml": { "version" : "~>0.5.0"},
-    },
+        "dyaml": { "version" : "*"}
+    }
 }

examples/constructor/main.d

@@ -1,6 +1,6 @@
 import std.stdio;
 import std.string;
-import dyaml.all;
+import dyaml;
 
 struct Color
 {