update README

README.md

@@ -6,12 +6,12 @@ Parts of Malachite are derived from [GMP](https://gmplib.org/),
 [FLINT](https://www.flintlib.org/), and [MPFR](https://www.mpfr.org/).
 
 Floats (arbitrary-precision floating-point numbers) are in development and are currently
-experimental. They are missing many important functions. However, the functions that are currently
+experimental. They are missing many important functions. However, the floating-point functions that *are* currently
 implemented are thoroughly tested and documented, with the exception of string conversion
-functions. The current string conversions are incomplete and will be changed in the future to
+functions. The current floating-point string conversion functions are incomplete and will be changed in the future to
 match MPFR's behavior.
 
-Malachite is developed by Mikhail Hogrefe. Thanks to b4D8, florian1345, konstin, Rowan Hart, YunWon Jeong, Park Joon-Kyu, Antonio Mamić, OliverNChalk, and shekohex for additional contributions.
+Malachite is developed by Mikhail Hogrefe. Thanks to Rowan Hart, YunWon Jeong, Park Joon-Kyu, Antonio Mamić, John Vandenberg, b4D8, florian1345, konstin, OliverNChalk, and shekohex for additional contributions.
 
 <https://www.malachite.rs/>