docs : rename position

Author: oxdjww

README.md

@@ -2,7 +2,7 @@
 
 |                         앤디/이유제                         |                           마루/김대휘                           |                         소피/이소정                         |                          세헌/호세헌                          |                        태태/권정태                        |
 |:------------------------------------------------------:|:----------------------------------------------------------:|:------------------------------------------------------:|:--------------------------------------------------------:|:----------------------------------------------------:|
-|              Part Lead / Server Developer              |                      Server Developer                      |                    Server Developer                    |                     Server Developer                     |                   Server Developer                   |
+|              Part Lead / Backend Developer              |                      Backend Developer                      |                    Backend Developer                    |                     Backend Developer                     |                   Backend Developer                   |
 | <center>[dbwp031](https://github.com/dbwp031)</center> | <center>[marooo326](https://github.com/marooo326)</center> | <center>[xxoznge](https://github.com/xxoznge)</center> | <center>[seheonnn](https://github.com/seheonnn)</center> | <center>[oxdjww](https://github.com/oxdjww)</center> |
 
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