Update crate documentation link

Author: eldruin

Cargo.toml

@@ -6,7 +6,7 @@ authors = ["Paul Osborne <osbpau@gmail.com>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rust-embedded/rust-i2cdev"
 homepage = "https://github.com/rust-embedded/rust-i2cdev"
-documentation = "http://rust-embedded.github.io/rust-i2cdev"
+documentation = "https://docs.rs/i2cdev"
 description = """
 Provides API for safe access to Linux i2c device interface.