upgrade google-api-python-client from 1.6.3 to 1.7.4

inspired by https://developers.googleblog.com/2018/03/discontinuing-support-for-json-rpc-and.html

had to pay attention to googleapis/google-api-python-client#469 since it affects us, but we pass its criteria - we do `build(..., http=httplib2.Http())` explicitly - so we should be ok.

requirements.freeze.txt

@@ -4,7 +4,7 @@ chardet==3.0.4
 coverage==4.0.3
 -e [email protected]:snarfed/gdata-python-client-1.git@1df4e1efea7e5cf2754bc7eec6c1ab48ab09e3b1#egg=gdata
 future==0.16.0
-google-api-python-client==1.6.3
+google-api-python-client==1.7.4
 html5lib==0.9999999
 httplib2==0.10.3
 humanize==0.5.1

requirements.txt

@@ -1,7 +1,7 @@
 # Keep in sync with setup.py's install_requires!
 -e git+https://github.com/snarfed/gdata-python-client-1.git#egg=gdata
 future
-google-api-python-client>=1.6.3
+google-api-python-client>=1.7.4
 httplib2
 humanize
 oauth2client>=4.1.1

setup.py

@@ -45,7 +45,7 @@ def __init__(self, *args, **kwargs):
       install_requires=[
           'future>=0.16.0',
           'gdata>=2.0.18',
-          'google-api-python-client>=1.6.3',
+          'google-api-python-client>=1.7.4',
           'httplib2',
           'humanize',
           'oauth2client>=4.1.1',