Update version to 1.2.3 (#741)

Author: Kenadia

setup.py

@@ -179,7 +179,7 @@ def run_tests(self):
 
 setup(
     name='openhtf',
-    version='1.2.2',
+    version='1.2.3',
     description='OpenHTF, the open hardware testing framework.',
     author='John Hawley',
     author_email='madsci@google.com',