Bump google_compute_engine to 2.3.7 (#404)

diff --git a/setup.py b/setup.py
index 652a7a1..183eec1 100755
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
     packages=setuptools.find_packages(),
     scripts=glob.glob('scripts/*'),
     url='https://github.com/GoogleCloudPlatform/compute-image-packages',
-    version='2.3.6',
+    version='2.3.7',
     # Entry points create scripts in /usr/bin that call a function.
     entry_points={
         'console_scripts': [