Bump version to v0.9-rc1

The internal review has concluded. The next steps are another TSC
review and an ARC freeze request. When those conclude and the spec
is frozen, we'll tag the spec as v0.9, so start tagging current
versions as v0.9 release candidates.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>

Author: jones-drew

Makefile

@@ -13,7 +13,7 @@
 # the Doc Template for RISC-V Extensions.
 
 DATE ?= $(shell date +%Y-%m-%d)
-VERSION ?= v0.8
+VERSION ?= v0.9-rc1
 REVMARK ?= "This document is in development. Assume everything can change. See http://riscv.org/spec-state for details."
 DOCKER_RUN := docker run --rm -v ${PWD}:/build -w /build \
 riscvintl/riscv-docs-base-container-image:latest