Merge pull request #54 from airbnb/nray_bump_version

Bump version to 0.6.4

Author: NiharikaRay

knowledge_repo/_version.py

@@ -4,7 +4,7 @@
 
 __author__ = "Nikki Ray (maintainer), Robert Chang, Dan Frank,  Chetan Sharma,  Matthew Wardrop"
 __author_email__ = "nikki.ray@airbnb.com, robert.chang@airbnb.com, dan.frank@airbnb.com, chetan.sharma@airbnb.com, matthew.wardrop@airbnb.com"
-__version__ = "0.6.3"
+__version__ = "0.6.4"
 try:
     with open(os.devnull, 'w') as devnull:
         __version__ += '_' + subprocess.check_output(['git', 'rev-parse', 'HEAD'], shell=False, stderr=devnull).decode('utf-8').replace('\n', '')