Update RELEASE.md

Update RELEASE.md as part of the release process.

Author: akhorlin

RELEASE.md

@@ -13,9 +13,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================-->
 
-# Current version 0.10.0-dev
-  * Under development
-
 # Current version 0.9.0
   * Add SavedModel.LoadOptions to hub.KerasLayer API to pass to load_v2.
   * Improved error messaging.