update news

Author: heltonmc

NEWS.md

@@ -11,7 +11,8 @@ For bug fixes, performance enhancements, or fixes to unexported functions we wil
 # Unreleased
 
 ### Added
- - Add more optimized methods for Float32 calculations that are faster([PR #43](https://github.com/JuliaMath/Bessels.jl/pull/43))
+ - Add more optimized methods for Float32 calculations that are faster ([PR #43](https://github.com/JuliaMath/Bessels.jl/pull/43))
+ - Add methods for computing modified spherical bessel function of second ([PR #46](https://github.com/JuliaMath/Bessels.jl/pull/46) and ([PR #47](https://github.com/JuliaMath/Bessels.jl/pull/47))) currently unexported closes ([Issue #25](https://github.com/JuliaMath/Bessels.jl/issues/25))
 
 ### Fixed
  - Reduce compile time and time to first call of besselj and bessely ([PR #42](https://github.com/JuliaMath/Bessels.jl/pull/42))