Upgrade to maven-javadoc-plugin 3.0.1
Upgrade to maven-javadoc-plugin 3.0.1

Notably this fixes issues with newer versions of Java.  Release notes:

https://mail-archives.apache.org/mod_mbox/maven-announce/201712.mbox/%3Cop.zaufhhzukdkhrr%40desktop-2khsk44.mshome.net%3E
https://mail-archives.apache.org/mod_mbox/maven-announce/201805.mbox/%3Cop.zjqrfkbukdkhrr%40desktop-2khsk44%3E

timuralp/s3proxy,andrewgaul/s3proxy,timuralp/s3proxy,andrewgaul/s3proxy