Update Readme.md
update clear line number method
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@ -56,15 +56,15 @@ $ ./ssd1306_bin -I 64x48
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### clear display
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- clear 1st line
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```sh
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./ssd1306_bin -c 0
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./ssd1306_bin -c0
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```
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- clear 2nd line
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```sh
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$ ./ssd1306_bin -c 1
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$ ./ssd1306_bin -c1
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```
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- clear 4th line
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```sh
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$ ./ssd1306_bin -c 3
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$ ./ssd1306_bin -c3
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```
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- clear whole screen
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```sh
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