Bump version numbers and add -dev suffix following release

Author: jessebraham

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "cargo-espflash"
-version = "1.3.0"
+version = "1.4.0-dev"
 authors = [
     "Robin Appelman <[email protected]>",
     "Jesse Braham <[email protected]>",
@@ -33,7 +33,7 @@ cargo_metadata = "0.14"
 cargo_toml = "0.11"
 clap = { version = "3.0", features = ["derive"] }
 crossterm = "0.23"
-espflash = { version = "1", path = "../espflash" }
+espflash = { version = "1.4.0-dev", path = "../espflash" }
 miette = { version = "4.0", features = ["fancy"] }
 serde = { version = "1.0", features = ["derive"] }
 thiserror = "1.0"

cargo-espflash/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "espflash"
-version = "1.3.0"
+version = "1.4.0-dev"
 authors = [
     "Robin Appelman <[email protected]>",
     "Jesse Braham <[email protected]>",