Pass required callback function for i2c write #16
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`i2c` library requires a callback function when calling the `write` function.
Passing a `noop` function to avoid the following error when initializing the i2c reader:
```
.../node_modules/i2c/lib/i2c.coffee:88
return callback(err);
^
TypeError: callback is not a function
at Immediate.<anonymous> (.../node_modules/i2c/lib/i2c.coffee:54:9)
at runCallback (timers.js:672:20)
at tryOnImmediate (timers.js:645:5)
at processImmediate [as _immediateCallback] (timers.js:617:5)
```
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i2clibrary requires a callback function when calling thewritefunction.Passing a
noopfunction to avoid the following error when initializing the i2c reader: