Bump the version to 1.0.0.

Raises the version to the first major one. The crate has been to long on
the outskirts, hidden somewhere along the "still in development" crates,
while it has actually been functional for a long time. Let's start being
serious.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "thread-priority"
-version = "0.17.0"
+version = "1.0.0"
 authors = ["Victor Polevoy <fx@thefx.co>"]
 description = "Library for managing threads priority and schedule policies"
 repository = "https://github.com/iddm/thread-priority"