Fix typos

Author: ktwtnb

README.md

@@ -23,7 +23,6 @@ Additionally, we would like to introduce libraries developed by enthusiastic con
 [mruby-esp32-spi](https://github.com/mruby-esp32/mruby-esp32-spi) by [yuuu](https://github.com/yuuu)  
 [mruby-esp32-adc](https://github.com/mruby-esp32/mruby-esp32-adc) by [yuuu](https://github.com/yuuu)  
 
-
 ## mruby/c
 
 ### RP2040