Use gen_value version 0.7

Author: bluk

Cargo.toml

@@ -31,7 +31,7 @@ bitvec = { version = "1.0", default-features = false }
 bt_bencode = { version = "0.7", default-features = false }
 bytes = { version = "1.1", default-features = false }
 crc32c = "0.6"
-gen_value = { version = "0.6", default-features = false }
+gen_value = { version = "0.7", default-features = false }
 rand = { version = "0.8", default-features = false }
 serde = { version = "1.0", default-features = false }
 serde_bytes = { version = "0.11", default-features = false }