Revert "Fix typo: Update footer year from 2022 to 2023"

This reverts commit c7a90ca.

Author: lamanda20

README.md

@@ -4,7 +4,6 @@
 
 A calculator that calculates simple interest given principal, annual rate of interest and time period in years.
 
-
 ```
 Input:
    p, principal amount
@@ -14,4 +13,4 @@ Output
    simple interest = p*t*r
 ```
 
-_© 2023 XYZ, Inc._
+_© 2022 XYZ, Inc._