undo workspace rename

WORKSPACE

@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-workspace(name = "cgdolan_rules_docker")
+workspace(name = "io_bazel_rules_docker")
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file")
 load(