API and build change and fix summaries. Doc correctsions
and/or changes are not mentioned here; see the commit messages.
+2020 January 23; verison 3.0.4
+ Fix bug in SI95 causing excessive CPU usage on poll.
+
+2020 January 22; verison 3.0.3
+ Enable thread support for multiple receive threads.
+
+2020 January 21; verison 3.0.2
+ Fix bug in SI95 (missing reallocate payload function).
+
2020 January 20; verison 3.0.1
Enable support for dynamic route table updates via RMR session.