Revert "pair develop examples with 1.16.0 now that support/1.15 has been created"

This reverts commit b43a28b3a00db9ea810a4bec60e10485b090ad11.
diff --git a/gradle.properties b/gradle.properties
index de0f807..bf8f18f 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -14,8 +14,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-version = 1.16.0-build.0
-geodeVersion = 1.16.+
+version = 1.15.0-build.0
+geodeVersion = 1.15.+
 
 # release properties, set these on the command line to validate against
 # a release candidate