Bump version and update url.

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "riscv"
-version = "0.2.0"
-repository = "https://github.com/dvc94ch/riscv"
+version = "0.3.0"
+repository = "https://github.com/rust-embedded/riscv"
 authors = ["David Craven <david@craven.ch>"]
 categories = ["embedded", "hardware-support", "no-std"]
 description = "Low level access to RISCV processors"