improve readme
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@ -15,6 +15,6 @@ This uses an AVR microcontroller (ATMega328P-PU, which is in the Uno R3).
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| 8 | Next button |
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| 9-10 | LEDs |
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| 11-13 | ISP Programmer, otherwise unused |
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| A0-A3 | Serial (with flow control) |
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| A4-A5 | I2C |
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| A0-A3 | Serial: DTR, TXD, RXD, CTS |
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| A4-A5 | I2C: SDA, SCL |
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