v5.0.0-beta2

Version 5.0.0-beta2

- [all] fixed a crash when pausing while reading thanks to @bminer and @baffo32 and others to debug and fix this
- [all] ReadLineParser has been renamed to ReadlineParser to match worldwide convention
- [windows] Fix flush behavior using PurgeComm fixing #962 via @samisaham
- [windows] Remove read and write timeouts solving #781 via @giseburt
- [docs] Electron build docs #965 via @chalkers
- [docs] Spelling fixes via @Awk34
- [docs] Update parser docs to be correct #970 via @jacobq
- [notes] buffer-indexof is now completely compliant with latest node 6 buffer.indexOf because it's nice to have and we now use it on older nodes
- [notes] dropped node 5 support, should still work but you shouldn't use it