Add --save to installation instructions
Add --save to installation instructions

Hey. Just reading through the README I noticed that you specify that you can install the module as a dependency with the command `npm install googleapis`. This is not strictly true. It will not be added as a dependecy unless you also add --save. 

Other than that, thanks so much for making this available and have a great weekend!
sqrrrl/google-api-nodejs-client,chitsuhein/google-api-nodejs-client,danielrasmuson/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,dstnation/google-api-nodejs-client,tbetbetbe/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,stems/google-api-nodejs-client,mcanthony/google-api-nodejs-client,PeterWangPo/google-api-nodejs-client,stems/google-api-nodejs-client,googleapis/google-api-nodejs-client,DIREKTSPEED-LTD/google-api-nodejs-client,codeRuth/google-api-nodejs-client,jagandecapri/google-api-nodejs-client,masterviana/google-api-nodejs-client,googleapis/google-api-nodejs-client,stems/google-api-nodejs-client,thdtjsdn/google-api-nodejs-client,juliankrispel/google-api-nodejs-client,digideskio/google-api-nodejs-client,stems/google-api-nodejs-client,googleapis/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,stems/google-api-nodejs-client,benjamin-chang/google-api-nodejs-client