Merge pull request #215 from JuliaControl/readme

Small updates to the readme

Author: baggepinnen

README.md

@@ -17,6 +17,8 @@ Pkg.add("ControlSystems")
 ```
 
 ## News
+### 2019-05-22
+New state-space type `HeteroStateSpace` that accepts matrices of heterogeneous types: [example using `StaticArrays`](https://juliacontrol.github.io/ControlSystems.jl/latest/man/creating_systems/#Creating-State-Space-Systems-1).
 ### 2019-01-31
 System identification using [ControlSystemIdentification.jl](https://github.com/baggepinnen/ControlSystemIdentification.jl) is now available. The [readme](https://github.com/baggepinnen/ControlSystemIdentification.jl) together with a series of notebooks serve as documentation.
 - [State-space identification](https://github.com/JuliaControl/ControlExamples.jl/blob/master/identification_statespace.ipynb)
@@ -35,7 +37,7 @@ ss(1.)
 ss(1im)
 ss(ForwardDiff.Dual(1.))
 ss(GPUArray([1]))
-ss(SparseMatrix([1])
+ss(SparseMatrix([1]))
 ```
 Similar for `tf,zpk` etc.
 - Continuous time systems are simulated with continuous time solvers from `OrdinaryDiffEq.jl`
@@ -50,15 +52,15 @@ Similar for `tf,zpk` etc.
 
 All functions have docstrings, which can be viewed from the REPL, using for example `?tf `.
 
-A documentation website under developement is available at [http://juliacontrol.github.io/ControlSystems.jl/latest/](http://juliacontrol.github.io/ControlSystems.jl/latest/).
+A documentation website is available at [http://juliacontrol.github.io/ControlSystems.jl/latest/](http://juliacontrol.github.io/ControlSystems.jl/latest/).
 
 Some of the available commands are:
 ##### Constructing systems
 ss, tf, zpk, ss2tf
 ##### Analysis
 pole, tzero, norm, norminf, ctrb, obsv, gangoffour, margin, markovparam, damp, dampreport, zpkdata, dcgain, covar, gram, sigma, sisomargin
 ##### Synthesis
-care, dare, dlyap, lqr, dlqr, place, leadlink, laglink, leadlinkat, rstd, rstc, dab
+care, dare, dlyap, lqr, dlqr, place, leadlink, laglink, leadlinkat, rstd, rstc, dab, balreal, baltrunc
 ###### PID design
 pid, stabregionPID, loopshapingPI, pidplots
 ##### Time and Frequency response