[Release] Update tfserving release version to 1.15.0+deeprec2204.

tensorflow_serving/tools/pip_package/setup.py

@@ -31,7 +31,7 @@
 DOCLINES = __doc__.split('\n')
 
 # Set when releasing a new version of TensorFlow Serving (e.g. 1.0.0).
-_VERSION = '1.15.0'
+_VERSION = '1.15.0+deeprec2204'
 # Have this by default be open; releasing a new version will lock to TF version
 _TF_VERSION = '~=1.15.0'
 _TF_VERSION_SANITIZED = _TF_VERSION.replace('-', '')