update electron and node versions

• update nodejs and electron versions
• update outdated dependencies

support new electron versions

v0.7.9

fix supported ABI List in readme

Update dependencies

v0.7.8

remove passus for pullrequests against abandoned project

Support for nodejs 10.x

Prebuilds have been generated for the new release up to node ABI version 64 (nodejs 10.x)

Build automation

With this release build automation with travis and appveyor is introduced.
New releases will be build against librsvg 2.40.16 and deployed automatically in s3

Also the flag RSVG_HANDLE_FLAG_KEEP_IMAGE_DATA will be used to minify
generated images from svgs with integrated jpegs. thanks @albe for this