Fixed issue with build process in Arch (AUR)

[codiflow]

Like described here the build process on Arch from the AUR fails with the following error message:

==================================== 3/3 =====================================
test:         notify:validate-appdata
start time:   17:59:40
duration:     0.02s
result:       exit status 1
command:      MALLOC_PERTURB_=136 MSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 MESON_TEST_ITERATION=1 ASAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1 UBSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 /usr/bin/appstream-util validate --nonet /home/username/notify-git/src/build/data/resources/com.ranfdev.Notify.metainfo.xml
----------------------------------- stdout -----------------------------------
/home/username/notify-git/src/build/data/resources/com.ranfdev.Notify.metainfo.xml: FAILED:
• style-invalid         : <ul> cannot start a description [(null)]
• style-invalid         : Not enough <p> tags for a good description [0/1]
----------------------------------- stderr -----------------------------------
Validation of files failed
==============================================================================

As I don't know why there has to be a <p> instead of the <ul> after <description> I just added a "fake paragraph" with Lorem ipsum text. Helps to fix the build errors. Feel free to change the content if necessary.