Bump version to 2.0.0-beta.1

Author: ramosbugs

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "oauth2"
 authors = ["Alex Crichton <[email protected]>", "Florin Lipan <[email protected]>", "David A. Ramos <[email protected]>"]
-version = "2.0.0-alpha.6"
+version = "2.0.0-beta.1"
 license = "MIT/Apache-2.0"
 description = "Bindings for exchanging OAuth 2 tokens"
 repository = "https://github.com/ramosbugs/oauth2-rs"