docs(README): change `color` to `colo[u]r` in the option description.

`eza` manpage and `README` have been refering to this option as `--colo[u]r`. We should follow the tradition and keep the writing style consistent.

Co-authored-by: MartinFillon <114775771+MartinFillon@users.noreply.github.com>
Signed-off-by: hehelego <hahalegao@gmail.com>

README.md

@@ -334,7 +334,7 @@ These options are available when running with `--long` (`-l`):
 
 Some of the options accept parameters:
 
-- Valid **--color** options are **always**, **automatic** (or **auto** for short), and **never**.
+- Valid **--co{u}lor** options are **always**, **automatic** (or **auto** for short), and **never**.
 - Valid sort fields are **accessed**, **changed**, **created**, **extension**, **Extension**, **inode**, **modified**, **name**, **Name**, **size**, **type**, and **none**. Fields starting with a capital letter sort uppercase before lowercase. The modified field has the aliases **date**, **time**, and **newest**, while its reverse has the aliases **age** and **oldest**.
 - Valid time fields are **modified**, **changed**, **accessed**, and **created**.
 - Valid time styles are **default**, **iso**, **long-iso**, **full-iso**, and **relative**.