i2c fails init on soft reboot

[ladyada]

a collision between #29 & auto-reset
if your main.py uses i2c it can't be re-run/saved because i2c will fail.

(i think this is also causing main.py with i2c in it to fail on first run but its impossible to tell cuz i can't see main.py error output)

>>> i2c = machine.I2C(machine.Pin('SCL'), machine.Pin('SDA'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: I2C bus init error

[tdicola]

Yeah this is currently by design, but #29 will fix it. For now use a context manager syntax in main.py like I show in this video and example: https://youtu.be/lbd9M7fY4mw?list=PLjF7R1fz_OOXrI15wuXeESA0aA4VzcWSi&t=1751 and https://gist.github.com/tdicola/2c42bfe534838b3c159c1b3cc3e58ac8 Also an example in the SAMD21 guide: https://learn.adafruit.com/micropython-for-samd21/quick-start-guide#i2c-devices

[ladyada]

aww yah that helps a ton!