readme update

readme.md

@@ -20,8 +20,12 @@ and field line tracing:
     - Rosenbrock
     - Tsit(5)
     - Runge Kutta Cash Karp
+- Parameters in the derivative and callback functions
+- Composite Algorithms
 - Automatic Stiffness Detection
+- Fixed Time Steps
 - Boolean callback eventing
+- Improved solution handling like `DifferentialEquations.jl`
 
 ## To Use
 
@@ -38,9 +42,9 @@ use differential_equations::problem::*;
 fn derivative(_t: f64, y: Vector3<f64>) -> Vector3<f64> { y }
 let y0 = Vector3::new(1.0, 1.0, 1.0);
 
-let ode = ODE::new(&derivative, 0.0, 5.0, y0);
+let ode = ODE::new(&derivative, 0.0, 10.0, y0);
 let dp45 = DormandPrince45::new(1e-12_f64, 1e-5_f64);
-let controller = PIController::new();
+let controller = PIController::default();
 
 let value_too_high = Callback {
     event: &|_: f64, y: SVector<f64,3>| { 10.0 - y[0] },