chore(revert): revert preventing normalization (#279)

reverts previous commit for preventing normalization of versioning

packages/google-cloud-dialogflow/setup.py

@@ -17,21 +17,6 @@
 
 import setuptools
 
-# Disable version normalization performed by setuptools.setup()
-try:
-    # Try the approach of using sic(), added in setuptools 46.1.0
-    from setuptools import sic
-except ImportError:
-    # Try the approach of replacing packaging.version.Version
-    sic = lambda v: v
-    try:
-        # setuptools >=39.0.0 uses packaging from setuptools.extern
-        from setuptools.extern import packaging
-    except ImportError:
-        # setuptools <39.0.0 uses packaging from pkg_resources.extern
-        from pkg_resources.extern import packaging
-    packaging.version.Version = packaging.version.LegacyVersion
-
 name = "dialogflow"
 description = "Client library for the Dialogflow API"
 version = "2.1.2"
@@ -50,7 +35,7 @@
     name="google-cloud-dialogflow",
     description=description,
     long_description=readme,
-    version=sic(version),
+    version=version,
     author="Google LLC",
     author_email="googleapis-packages@google.com",
     license="Apache 2.0",