Add note about DTR behavior on linux #242
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TL;DR: Linux always sets DTR on open, and you can't prevent that without kernel modifications.
See #37 for more information, most importantly the linked stack overflow question. When working on #40 about 3 years ago, I verified that this was actually true. A quick search through the kernel git history didn't show any recent change.
The only thing I'm not sure about is if this is true for all serial ports on linux, or if it is driver dependent. So maybe the comment should be less strong? (Eg. "On Linux, DTR may automatically be set on open...")?