Merge pull request #17 from johvik/patch-1

Return value() in noexcept emplace

tl/optional.hpp

@@ -2252,6 +2252,7 @@ public:
 
     *this = nullopt;
     this->construct(std::forward<Args>(args)...);
+    return value();
   }
 
   /// Swaps this optional with the other.