Prepping release of alpha.6 (#5629)

* bumping version

* cargo update

* adding changelog

substrate/primitives/phragmen/compact/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sp-phragmen-compact"
-version = "2.0.0-dev"
+version = "2.0.0-dev.1"
 authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 license = "GPL-3.0"
@@ -8,6 +8,9 @@ homepage = "https://substrate.dev"
 repository = "https://github.com/paritytech/substrate/"
 description = "Phragmen Compact Solution"
 
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
 [lib]
 proc-macro = true
 
@@ -16,6 +19,3 @@ syn = { version = "1.0.7", features = ["full", "visit"] }
 quote = "1.0"
 proc-macro2 = "1.0.6"
 proc-macro-crate = "0.1.4"
-
-[package.metadata.docs.rs]
-targets = ["x86_64-unknown-linux-gnu"]