Bump version to 1.18.4 (aws#687)

Author: iquintero

CHANGELOG.rst

@@ -3,8 +3,8 @@ CHANGELOG
 =========
 
 
-1.18.4.dev
-==========
+1.18.4
+======
 
 * doc-fix: Remove incorrect parameter for EI TFS Python README
 * feature: ``Predictor``: delete SageMaker model

setup.py

@@ -33,7 +33,7 @@ def read(fname):
     required_packages.append('enum34>=1.1.6')
 
 setup(name="sagemaker",
-      version='1.18.3.post1',
+      version='1.18.4',
       description="Open source library for training and deploying models on Amazon SageMaker.",
       packages=find_packages('src'),
       package_dir={'': 'src'},