initialize Wire lib in I2C setup

[andr35]

I've add a line to initialize the Wire library during the I2C setup.
I've tested the code on an ESP8266 and without the init line the I2C protocol doesn't work.

[nseidle]

Wire.begin is left to the user to do in their setup() or elsewhere. It should not be in a library.

I really appreciate the PR but we refrain from Wire.begins() inside libraries for a variety of reasons.

• Wire.begin can overwrite the user's previous Wire.setClock settings
• Calling Wire.begin multiple times can cause some platforms to crash (I believe ESP8266 had this issue)
• A well written library does not hard code Wire. See this post

Please keep the PRs coming. We can always make things better.

[andr35]

I've got the point.
Thanks for the reference!