Add metadata for bdk-macros, bump its version

macros/Cargo.toml

@@ -1,8 +1,14 @@
 [package]
 name = "bdk-macros"
-version = "0.1.0-beta.1"
+version = "0.2.0"
 authors = ["Alekos Filini <alekos.filini@gmail.com>"]
 edition = "2018"
+homepage = "https://bitcoindevkit.org"
+repository = "https://github.com/bitcoindevkit/bdk"
+documentation = "https://docs.rs/bdk-macros"
+description = "Supporting macros for `bdk`"
+keywords = ["bdk"]
+license-file = "../LICENSE"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html