Unity SDK for SpacetimeDB 0.7.0

What's Changed

• README.md and LICENSE.txt updates by @dbrinkmanncw in clockworklabs/com.clockworklabs.spacetimedbsdk#3
• Small fixes for 0.7.0 by @jdetter in clockworklabs/com.clockworklabs.spacetimedbsdk#5
• Release v0.7.0-beta by @jdetter in clockworklabs/com.clockworklabs.spacetimedbsdk#4
• Update package version to 0.7.0 by @jdetter in clockworklabs/com.clockworklabs.spacetimedbsdk#6
• Added IsConnected function by @jdetter in clockworklabs/com.clockworklabs.spacetimedbsdk#9

Full Changelog: clockworklabs/com.clockworklabs.spacetimedbsdk@0.6.0...v0.7.0-beta