Release v0.7.0

[saubyk]

New Release:
https://github.com/Ride-The-Lightning/c-lightning-REST/releases/tag/v0.7.0

New APIs:

• Funderupdate: Update node policy for dual funded channels and liquidity ads
• Listnodes: Fetch node info from the network graph, including liquidity ads
• Datastore: Add, List and Delete data items on the C-Lightning database

Updated APIs:

• Openchannel: API updated to include params for requesting liquidity from peers

Other changes:

• Support for adding an optional external domain to the certificate
• Dependency updates for reported vulernabilities

Contributors:
@saubyk
@willcl-ark