readme: use spaces for list indent

README.md

@@ -5,22 +5,22 @@ Pluggable, composable, unopinionated modules for building a
 code you were going to write anyway.
 
 - wlroots provides backends that abstract the underlying display and input
-	hardware, including KMS/DRM, libinput, Wayland, X11, and headless backends,
-	plus any custom backends you choose to write, which can all be created or
-	destroyed at runtime and used in concert with each other.
+  hardware, including KMS/DRM, libinput, Wayland, X11, and headless backends,
+  plus any custom backends you choose to write, which can all be created or
+  destroyed at runtime and used in concert with each other.
 - wlroots provides unopinionated, mostly standalone implementations of many
-	Wayland interfaces, both from wayland.xml and various protocol extensions.
-	We also promote the standardization of portable extensions across
-	many compositors.
+  Wayland interfaces, both from wayland.xml and various protocol extensions.
+  We also promote the standardization of portable extensions across
+  many compositors.
 - wlroots provides several powerful, standalone, and optional tools that
-	implement components common to many compositors, such as the arrangement of
-	outputs in physical space.
+  implement components common to many compositors, such as the arrangement of
+  outputs in physical space.
 - wlroots provides an Xwayland abstraction that allows you to have excellent
-	Xwayland support without worrying about writing your own X11 window manager
-	on top of writing your compositor.
+  Xwayland support without worrying about writing your own X11 window manager
+  on top of writing your compositor.
 - wlroots provides a renderer abstraction that simple compositors can use to
-	avoid writing GL code directly, but which steps out of the way when your
-	needs demand custom rendering code.
+  avoid writing GL code directly, but which steps out of the way when your
+  needs demand custom rendering code.
 
 wlroots implements a huge variety of Wayland compositor features and implements
 them *right*, so you can focus on the features that make your compositor