Update README.md

happybono · Jan 5, 2021 · ea930c7 · ea930c7
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 * D5 : TX of PN532
 * D6 : MISO of PN532
 * D7 : MOSI of PN532
+* GND : GND of PN532
+* VIN : VCC of PN532
 
 ### 0.96" SSD1306 I2C OLED Display 
 * Soldering required