Updated README.md adding the missing [input] to the example.

README.md

@@ -126,6 +126,7 @@ Note that button mappings can cause input lag of up to 1 frame depending on when
 
 Example:
 ```
+[input]
 RIGHT=RIGHT,CP_RIGHT
 LEFT=LEFT,CP_LEFT
 UP=UP,CP_UP
@@ -257,4 +258,4 @@ You may use this under the terms of the GNU General Public License GPL v3 or the
 * **Oleh Prypin (oprypin) for nightly.link**
 * ...everyone who contributed to **3dbrew.org**
 
-Copyright (C) 2021 derrek, profi200, d0k3
+Copyright (C) 2021 derrek, profi200, d0k3