fix doctest

src/lib.rs

@@ -28,7 +28,7 @@
 //! let stars = diff_attrs.stars();
 //!
 //! // Calculate performance attributes
-//! let perf_attrs = rosu_pp::Performance::from_attributes(diff_attrs)
+//! let perf_attrs = rosu_pp::Performance::new(diff_attrs)
 //!     // To speed up the calculation, we used the previous attributes.
 //!     // **Note** that this should only be done if the map and all difficulty
 //!     // settings stay the same, otherwise the final attributes will be incorrect!