1.0.20-3.0.10

Improvements

• Add schema backup to backup operation (#311)
• Add 'existing'/'new' restore type option to restore operation (#324)
• Add support for specifying Marathon-style constraints on node deployment (#333)
• Update to dcos-commons 0.8.1 (#328)

Fixes

• Clear preexisting snapshot before creating a new snapshot (#323)

Upgrades

• Update to Cassandra 3.0.10 (#317)