0.7.0

updates

• Use sbt-ci-release. change groupId by @xuwei-k in #74
• Use protoc-jar to download protoc automatically by @eed3si9n in #67

behind the scene

• Update sbt to 1.3.5 by @xuwei-k in #66
• Bump actions/checkout from v1 to v2.3.4 by @dependabot in #68
• Update sbt-release to 1.0.15 by @scala-steward-bot in #72

Full Changelog: v0.6.5...v0.7.0