Fix #691 Cache SSL certificate files certChainFile and keyFile for 1 …

…hour, and reload them if they are modified

Release 3.30.1

Released 3.30.0

#684 Drop support for Scala 2.11

Fix typos in version numbers

Fix #679 Update dependency libraries

#675 Cannot use Java 8 syntax due to Scala 2.11 support

#674 Update dependency libraries

Fix #672 Update dependency libraries

#666 Update netty-tcnative from 2.0.17.Final to 2.0.18.Final