* __raw_input()__ was removed in Python 3 in favor of __input()__
* Fix __sleep()__ to match the import on line 22
[flake8](http://flake8.pycqa.org) testing of https://github.com/node-red/node-red on Python 3.7.0
$ __flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics__
```
./nodes/core/hardware/nrgpio.py:45:24: F821 undefined name 'raw_input'
data = raw_input()
^
./nodes/core/hardware/nrgpio.py:63:24: F821 undefined name 'raw_input'
data = raw_input()
^
./nodes/core/hardware/nrgpio.py:85:24: F821 undefined name 'raw_input'
data = raw_input()
^
./nodes/core/hardware/nrgpio.py:120:24: F821 undefined name 'raw_input'
data = raw_input()
^
./nodes/core/hardware/nrgpio.py:134:24: F821 undefined name 'raw_input'
data = raw_input()
^
./nodes/core/hardware/nrgpio.py:164:24: F821 undefined name 'raw_input'
data = raw_input()
^
./nodes/core/hardware/nrgpio.py:201:17: F821 undefined name 'time'
time.sleep(10)
^
7 F821 undefined name 'raw_input'
7
```
@dceejay
