doc: Fix case of "flusio"

I like to make my life difficult. First I wanted people to pronounce
"Flus" instead of "Flusio". And now, while I'm making a compromise, I
want people to write "flusio" instead of "Flusio". Haha, this will never
work! :p

LICENSE.txt

@@ -629,7 +629,7 @@ to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
 
-    Flusio
+    flusio
     Copyright (C) 2020 Flus / Marien Fressinaud
 
     This program is free software: you can redistribute it and/or modify

README.md

@@ -1,12 +1,12 @@
-<h1 align="center">Flusio</h1>
+<h1 align="center">flusio</h1>
 
 <p align="center">
     <strong>A citizen social media to soothe our online relationship with the news.</strong>
 </p>
 
 ---
 
-Flusio is another yet social media. It brings together social bookmarking and
+flusio is another yet social media. It brings together social bookmarking and
 Web syndication to allow communities to stay up to date with the news and to
 enhance their knowledge.
 
@@ -23,4 +23,4 @@ There’s no process to contribute yet, but feel free to [reach me by email](mai
 
 ## License
 
-Flusio is licensed under [AGPL 3](LICENSE.txt).
+flusio is licensed under [AGPL 3](LICENSE.txt).