Cargo.toml fixups for the release (#4975)

* setting versions to development pre-release

fixing version in dependencies

* unset already released wasm-builder

* do not publish test crates

* adding licenses

* setting homepage metadata

* set repository url

substrate/utils/build-script-utils/Cargo.toml

@@ -1,8 +1,10 @@
 [package]
 name = "substrate-build-script-utils"
-version = "2.0.0"
+version = "2.0.0-dev"
 authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 license = "GPL-3.0"
+homepage = "https://substrate.dev"
+repository = "https://github.com/paritytech/substrate/"
 
 [dependencies]