Bump to v0.4.0

Signed-off-by: Andy Goldstein <andy.goldstein@gmail.com>

CHANGELOG.md

 # Changelog
 
+#### [v0.4.0](https://github.com/heptio/ark/tree/v0.4.0) - 2017-09-14
+Breaking changes:
+  * Snapshotting and restoring volumes is now enabled by default
+  * The --namespaces flag for 'ark restore create' has been replaced by --include-namespaces and
+    --exclude-namespaces
+
+New features:
+  * Support for S3 SSE with KMS
+  * Cloud provider configurations are validated at startup
+  * The persistentVolumeProvider is now optional
+  * Restore objects are garbage collected
+  * Each backup now has an associated log file, viewable via 'ark backup logs'
+  * Each restore now has an associated log file, viewable via 'ark restore logs'
+  * Add --include-resources/--exclude-resources for restores
+
+Bug fixes:
+  * Only save/use iops for io1 volumes on AWS
+  * When restoring, try to retrieve the Backup directly from object storage if it's not found
+  * When syncing Backups from object storage to Kubernetes, don't return at the first error
+    encountered
+  * More closely match how kubectl performs kubeconfig resolution
+  * Increase default Azure API request timeout to 2 minutes
+  * Update Azure diskURI to match diskName
+
 #### [v0.3.3](https://github.com/heptio/ark/tree/v0.3.3) - 2017-08-10
   * Treat the first field in a schedule's cron expression as minutes, not seconds
 

Makefile

@@ -15,7 +15,7 @@
 # project related vars
 ROOT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))
 PROJECT = ark
-VERSION ?= v0.3.3
+VERSION ?= v0.4.0
 GOTARGET = github.com/heptio/$(PROJECT)
 OUTPUT_DIR = $(ROOT_DIR)/_output
 BIN_DIR = $(OUTPUT_DIR)/bin