chip property is not required for Gemma or Trinket upon instantiation

README.md

@@ -72,6 +72,8 @@ Which USBtinyISP programmer is being used? String values for supported programme
 
 **options.chip**
 
+*Note:* this property is not required if your programmer is an Arduino Gemma, Adafruit Gemma v2 , or Adafruit Trinket.
+
 The chip property is an object that follows a strict format / signature. It specifies the configuration properties of the microchip you are using.  You'll need to know and supply this configuration. You can find this from AVR Studio, the [avrgirl-chips-json package](https://www.npmjs.com/package/avrgirl-chips-json), or use the [AVRDUDE conf API](avrdude-conf.herokuapp.com). Pull requests to the [avrgirl-chips-json repo](https://github.com/noopkat/avrgirl-chips-json) with additional chips is most welcome.
 
 Here is the required signature, provided as an example of the ATtiny85:

avrgirl-usbtinyisp.js

@@ -7,7 +7,7 @@ var async = require('async');
 var programmers = require('./lib/programmers');
 var intelhex = require('intel-hex');
 var fs = require('fs');
-
+var chips = require('avrgirl-chips-json');
 /**
  * Constructor
  *
@@ -23,7 +23,7 @@ function avrgirlUsbTinyIsp (options) {
   this.options = {
     sck: options.sck || C.SCK_DEFAULT,
     debug: options.debug || false,
-    chip: options.chip,
+    chip: options.chip || chips.attiny85,
     log: this.hackerLog,  // for usbtinyisp lib
     programmer: options.programmer || null
   };

package.json

@@ -23,13 +23,13 @@
   "author": "Suz Hinton",
   "license": "MIT",
   "dependencies": {
+    "avrgirl-chips-json": "^2.0.1",
     "async": "^1.4.2",
     "buffer-equal": "0.0.1",
     "usbtinyisp": "git://github.com/noopkat/usbtinyisp",
     "intel-hex": "^0.1.1"
   },
   "devDependencies": {
-    "avrgirl-chips-json": "^2.0.1",
     "istanbul": "^0.3.22",
     "istanbul-coveralls": "^1.0.3",
     "proxyquire": "^1.7.3",