Update README and docker

.gitlab-ci.yml

 # gitlab-ci file for aedmi
 
 default:
-    image: rboman/waves-py3:latest
+    image: rboman/waves-py3:2023.0
 
 .global_tag: &global_tag_def
     tags:

README.md

@@ -13,14 +13,14 @@ aedmi computes the solution of the aeroelastic equation `u/l * M * p^2 + K - 1/2
 The flutter solution is obtained using a kind of reduced order modeling technique called dynamic mode interpolation. This technique was originally developed by Hüseyin Güner during his [doctoral thesis](http://hdl.handle.net/2268/245578). Practically, the mode shapes of the structure are first pre-computed. Then, the aerodynamic loads at some reference Mach numbers and reduced frequencies are pre-computed by imposing the motion for each structural mode shape. Finally, aedmi will compute the modal load matrix `Q` for each Mach number and reduced frequency, and solve the aeroelastic system by interpolating this matrix for any reduced frequency.
 
 ## Requirements
-aedmi needs a python 3 interpreter and its libraries, as well the `numpy`, and `scipy`. The `vtk` packages is also needed to read VTK formatted date, and the `matplotlib` package is optional (needed to save the graphical solution to disk).
+aedmi needs a Python3 interpreter and its libraries, as well the `numpy`, and `scipy`. The `vtk` packages is also needed to read VTK formatted data, and the `matplotlib` package is optional (needed to save the graphical solution to disk).
 
 ### Linux
 If you are using Linux, you can install python and the packages using Aptitude.
 ```bash
 sudo apt-get update
 sudo apt-get install python3-dev
-sudo apt-get install python3-numpy python3-scipy python3-vtk7 python3-matplotlib
+sudo apt-get install python3-numpy python3-scipy python3-vtk9 python3-matplotlib
 ```
 
 ### Windows and MacOS