Update README.md

README.md

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 # PythonPlantsVsZombies
-a simple PlantsVsZombies game. 
-It's just for learning and noncommercial use. If this game infringes the copyright, please let me know.
+  A simple PlantsVsZombies game. <br>
+  `It's only for personal learning and noncommercial use. If this game infringes the copyright, please let me know.`
 * implement plants: sunflower, peashooter, wallnut, snowpeashooter, cherrybomb, threepeashooter, chomper, puffshroom, potatomine, spikeweed, scaredyshroom, squash, scaredyshroom, jalapeno, sunShroom, iceShroom, hypnoShroom.
 * implement zombies: zombie, flagzombie, coneheadzombie, bucketheadzombie, newspaperzombie.
 * use json file to store level data (e.g.position and time of zombies, background info)
 * support to select plant cards at the beginning of the level
-* support night level, moving card select level and wallnut bowling level
+* support day level, night level, moving card select level and wallnut bowling level
 
 # Requirement
 * Python 3.7