specify espflash version

Author: icewind1991

cargo-espflash/Cargo.toml

@@ -29,7 +29,7 @@ cargo_metadata = "0.14"
 cargo_toml = "0.10"
 clap = "2.33"
 crossterm = "0.21"
-espflash = { version = "*", path = "../espflash" }
+espflash = { version = "1", path = "../espflash" }
 guess_host_triple = "0.1"
 serde = { version = "1.0", features = ["derive"] }
 serial = "0.4"