potential update for our ev3dev.cpp file

[Eisverygoodletter]

Is your feature request related to a problem? Please describe.
On the original repo where we got the file there is now a pull request
ddemidov/ev3dev-lang-cpp#56
with some changes for speeding up read speeds

Describe the solution you'd like
Consider updating our ev3dev.cpp file

[Eisverygoodletter]

note: the issue in the original repo is ddemidov/ev3dev-lang-cpp#49 .