README.md update: protocol parameter info
Merge pull request #83 from cy6erskunk/master

README.md update: protocol parameter info
use contimer for measuring network and total request execution time
release 0.4.2
use `requestId` in the contimer timers IDs
release 0.4.3
fix #84 broken timings in the error messages on failed retries
release 0.4.4
support-no-keepalive: support no keepalive