bump rust-bitcoin to v0.27

sandipndev · sandipndev · commit 5bb6bc7afe7e · 2021-07-28T23:42:31.000+05:30
diff --git a/Cargo.toml b/Cargo.toml
@@ -16,7 +16,7 @@ use-serde = ["bitcoin/use-serde", "serde"]
 rand = ["bitcoin/rand"]
 
 [dependencies]
-bitcoin = "0.26.2"
+bitcoin = "0.27"
 
 [dependencies.serde]
 version = "1.0"
