NPM echo-js pulling older version than stated

[brianchristopherpeck]

npm install echo-js pulls version 1.7.0 instead of 1.7.3 as of 9/5/17. On install, it says
└── [email protected]
The main difference in versions is this line:
var nodes = (context || document).querySelectorAll('[data-echo], [data-echo-background]');
which in the older version being downloaded is this:
var nodes = (context || document).querySelectorAll('img[data-echo], [data-echo-background]');
This forces only images whereas in 1.7.3, the removal of the image selector allows to lazy-load other media like youtube videos