Bump version to 0.1.3

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "riscv"
-version = "0.1.2"
+version = "0.1.3"
 repository = "https://github.com/dvc94ch/riscv"
 authors = ["David Craven <david@craven.ch>"]
 categories = ["embedded", "hardware-support", "no-std"]