Update crate version and add experimental badge.

Signed-off-by: Andrei Sandu <[email protected]>

Author: sandreim

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "versionize_derive"
-version = "0.1.2"
+version = "0.1.3"
 license = "Apache-2.0"
 authors = ["Amazon Firecracker team <[email protected]>"]
 description = "Implements the Versionize derive proc macro."
@@ -16,4 +16,5 @@ syn = { version = ">=1.0.13", features=["full", "extra-traits"]}
 [lib]
 proc-macro = true
 
-
+[badges]
+maintenance = { status = "experimental" }