Update instructions for browserify => webpack

Author: jnthn

web-frontend/README.md

@@ -1,7 +1,7 @@
 # cro web frontend
 
 The `cro web` frontend is a React.js/Redux.js application, bundled into a
-single JavaScript using browserify. It is written in ES6, with babel being
+single JavaScript file using webpack. It is written in ES6, with babel being
 used to translate it into the JavaScript browsers more widely support. The
 generated bundle is committed into `../resources/`, so that `cro` users do
 not need to install a JavaScript build toolchain in order to use `cro`; only
@@ -11,7 +11,7 @@ setup of a build toolchain.
 ## Setup
 
 1. Install Node.js and `npm`.
-2. `npm install -g browserify`
+2. `npm install -g webpack`
 3. npm install .
 
 ## Building