Add comments about tech support

OneWire.cpp

@@ -5,15 +5,35 @@ The latest version of this library may be found at:
   http://www.pjrc.com/teensy/td_libs_OneWire.html
 
 OneWire has been maintained by Paul Stoffregen (paul@pjrc.com) since
-January 2010.  At the time, it was in need of many bug fixes, but had
+January 2010.
+
+DO NOT EMAIL for technical support, especially not for ESP chips!
+All project support questions must be posted on public forums
+relevant to the board or chips used.  If using Arduino, post on
+Arduino's forum.  If using ESP, post on the ESP community forums.
+There is ABSOLUTELY NO TECH SUPPORT BY PRIVATE EMAIL!
+
+Github's issue tracker for OneWire should be used only to report
+specific bugs.  DO NOT request project support via Github.  All
+project and tech support questions must be posted on forums, not
+github issues.  If you experience a problem and you are not
+absolutely sure it's an issue with the library, ask on a forum
+first.  Only use github to report issues after experts have
+confirmed the issue is with OneWire rather than your project.
+
+Back in 2010, OneWire was in need of many bug fixes, but had
 been abandoned the original author (Jim Studt).  None of the known
 contributors were interested in maintaining OneWire.  Paul typically
 works on OneWire every 6 to 12 months.  Patches usually wait that
 long.  If anyone is interested in more actively maintaining OneWire,
-please contact Paul.
+please contact Paul (this is pretty much the only reason to use
+private email about OneWire).
+
+OneWire is now very mature code.  No changes other than adding
+definitions for newer hardware support are anticipated.
 
 Version 2.3:
-  Unknonw chip fallback mode, Roger Clark
+  Unknown chip fallback mode, Roger Clark
   Teensy-LC compatibility, Paul Stoffregen
   Search bug fix, Love Nystrom