Fix lightning-invoice recoverability.

Author: arik-so

lightning-invoice/Cargo.toml

@@ -23,7 +23,7 @@ std = ["bech32/std"]
 bech32 = { version = "0.9.1", default-features = false }
 lightning-types = { version = "0.1", path = "../lightning-types", default-features = false }
 serde = { version = "1.0.118", optional = true }
-bitcoin = { version = "0.32.2", default-features = false }
+bitcoin = { version = "0.32.2", default-features = false, features = ["secp-recovery"] }
 
 [dev-dependencies]
 serde_json = { version = "1"}