Fix 'bodySize' (and thus 'compression')
Fix 'bodySize' (and thus 'compression')

This was caused by a wrong interpretation of the fields in the
`Network.dataReceived` event. The proper description is:

- `dataLength`: unencoded payload;
- `encodedDataLength`: encoded payload **including headers**.

Fixes #25.

cyrus-and/chrome-har-capturer,faisal33/har-capturer