RSK PowPeg Arrowhead 6.2.0.0

What's Changed

• Bump version to 6.2.0.0 by @marcos-iov in #240
• Merge 6.1.0.0 into master by @marcos-iov in #242
• Fix command line note typo in README by @apancorb in #244
• Build and push docker image on git tag by @ATarrio in #248
• Avoid possible NPE when searching for event in past blocks by @apancorb in #249
• Fix misleading pegout logs and variables by @nathanieliov in #251
• Prepare 6.2.0.0 release by @marcos-iov in #266

Full Changelog: ARROWHEAD-6.1.0.0...ARROWHEAD-6.2.0.0

For specific information regarding the modifications made to the RSK client in this release, please consult the RSKj ARROWHEAD 6.2.0 release page.