Update README.md

Author: ChrisRackauckas

README.md

@@ -36,3 +36,24 @@ u0 = (1.0, 2.0) # brackets
 probB = IntervalNonlinearProblem(f, u0)
 sol = solve(probB, Falsi())
 ```
+
+## v1.0 Breaking Release Highlights!
+
+v1.0 has been released for NonlinearSolve.jl, making it a decentralized solver library
+akin to DifferentialEquations.jl. For simple implementations of nonlinear solvers,
+you can now use SimpleNonlinearSolve.jl. `Falsi`, `Bisection`, and `NewtonRahpson`
+implementations designed for scalar and static vector inputs have all moved to the
+lower dependency version. NonlinearSolve.jl is thus designed for the larger scale
+more complex implementations, with `NewtonRahpson` now sporting support for
+LinearSolve.jl and soon SparseDiffTools.jl to allow for preconditioned Newton-Krylov and 
+exploitation of sparsity. The two pieces will continue to grow in this direction,
+with NonlinearSolve.jl gaining more and more wrapped solver libraries and support
+for more complex methods, while SimpleNonlinearSolve.jl will keep a lower dependency
+version with implementations for small scale problems that do not need all of the
+extra tooling.
+
+Additionally, `NonlinearProblem` was split into `NonlinearProblem` and `IntervalNonlinearProblem`,
+i.e. the bracketing versions now have their own problem definition, rather than using
+a `Tuple` for `u0` in a `NonlinearProblem`. This helps for finding problem-algorithm
+pairing errors at type time and overall improves the documentation / makes the roles
+more clear.