Update version to 1.5.4
diff --git a/googleapiclient/__init__.py b/googleapiclient/__init__.py
index 0753586..bc59bdd 100644
--- a/googleapiclient/__init__.py
+++ b/googleapiclient/__init__.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.5.3"
+__version__ = "1.5.4"
 
 # Set default logging handler to avoid "No handler found" warnings.
 import logging