Fix readme typo

README.md

 Hudbars, hbhunger and hbarmor mods for Minetest
 
-These mod adds hud bars to the player's screen for health, hunger, drowning and armor levels.
+These mods add hud bars to the player's screen for health, hunger, drowning and armor levels.
 
 Mods created by Wuzzy and edited by TenPlus1 for Xanadu server
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