fix: simplify README (#38)

Simplify I2C instructions.

Author: zfields

README.md

@@ -49,12 +49,9 @@ notecard.begin(Serial1, 9600);
 
 ### I2C Configuration
 
-For I2C, initialize `Wire` by calling `begin()` and call Notecard `begin()` with
-no parameters.
+For I2C, you may simply call Notecard `begin()` with no parameters.
 
 ```cpp
-Wire.begin();
-
 notecard.begin();
 ```