Unit Tests - correction to T::compose tests

- Uses " instead of ' to quote annotations.

src/tests/t.t.cpp

@@ -86,7 +86,7 @@ int main (int argc, char** argv)
   t.setDescription ("sample");
   std::string format = t.compose ();
   test.is (format.substr (36, 20), " - [foo] [bar:baz] [", "compose tag, attribute");
-  test.is (format.substr (66, 16), ":'woof'] sample\n",    "compose annotation");
+  test.is (format.substr (66, 16), ":\"woof\"] sample\n",  "compose annotation");
   test.is (t.getAnnotationCount (), 1,                     "annotation count");
 
   return 0;