updated the version to be 1.x.y+snapshot, as 1.x.y-snapshot would cause

ci test failures.

Author: yliaog

devel/release.md

@@ -28,7 +28,7 @@ export PATCH_VERSION=y  # The latest patch version for the minor version. Not re
 ```
 To create a snapshot:
 ```
-$ KUBERNETES_BRANCH=release-1.${MINOR_VERSION} CLIENT_VERSION=${MINOR_VERSION}.0.0-snapshot DEVELOPMENT_STATUS="3 - Alpha" scripts/release.sh
+$ KUBERNETES_BRANCH=release-1.${MINOR_VERSION} CLIENT_VERSION=${MINOR_VERSION}.0.0+snapshot DEVELOPMENT_STATUS="3 - Alpha" scripts/release.sh
 ```
 To create an a1 release:
 ```