Updated build instructions (#3573)

Building on Ubuntu 18.04 no longer works as documented

```
CMake Error at lib/settings/CMakeLists.txt:132 (message):
  GCC version must be at least 8.0 if using std filesystem
```

I verified the build instructions on Ubuntu 20.04 and they work as advertised.

For Ubuntu 18.04, you'd have the option of
1) Manually installing a later version of GCC
2) Using clang
3) passing the `-DPAJLADA_SETTINGS_USE_BOOST_FILESYSTEM=1` flag to cmake
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ooxi 2022-02-27 10:34:49 +01:00 committed by GitHub
parent 218b6c5e57
commit 6f7961444f
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@ -2,7 +2,7 @@
Note on Qt version compatibility: If you are installing Qt from a package manager, please ensure the version you are installing is at least **Qt 5.12 or newer**.
## Ubuntu 18.04
## Ubuntu 20.04
_Most likely works the same for other Debian-like distros_