Buffer is broken for target: "webworker"

[haggholm]

The buffer module currently used (v4) performs a check of a variable explicitly on the global variable, something like if(global.TYPED_ARRAY_SUPPORT). As mentioned in #31, global is not polyfilled—at least it isn’t when building a Webpack bundle for the webworker target. As a result, code that relies on Webpack polyfilling the buffer module will break in webworkers.

This can be trivially fixed by updating to the latest version of the buffer module (5), but in #45 it seems that sticking to an older version is a deliberate decision.