Issue from zero/zero3/app-development/rtsp

In the tab **Based Gstreamer + gst-rtsp-server**, the document says that the meson should be installed via apt.
However, it results into error as result of `meson build`:
```
meson.build:1:0: ERROR: Meson version is 0.56.2 but project requires >= 1.1
```
In order to resolve this, I had to uninstall meson with apt, install meson with pip and restart shell