feat: added RawValue interface (#127)

* feat: added RawValue interface

To allow for the detection of a `nil` return, a new interface is added (to maintain backwards compatibility) and implemented by `value`. This interface, `RawValue`, allows the retrieval of the raw bytes but requires a type assertion.

* fix: add bytes to Value

* fix: use bytes for test

enable cgo for tests

Add location for snap version of Chromium (#69)

This adds another location in which Chromium can be found on Ubuntu.

Fixes #61

fix url regexp (#52)

fixes invalid control character in URL error on Windows

Merge branch 'master' of github.com:zserge/lorca

return eval errors during export

add functions to export page or svg to pdf and png formats (#22)

do not hardcode window class, let applications do it

add user local chrome installation path

Update README.md