fix: Update setup.py to install httplib2>=0.15.0

[tomchop]

I ran into the same issue described here: #1047

  File "/usr/local/lib/python3.6/dist-packages/googleapiclient/_helpers.py", line 134, in positional_wrapper
    return wrapped(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/googleapiclient/discovery.py", line 300, in build
    discovery_http.close()
AttributeError: 'Http' object has no attribute 'close'

From that same issue:

Having a look at httplib2 changelog, close() method appeared in v0.15.0

[busunkim96]

@aaltay Is it alright to bump this now?

[aaltay]

I believe it can be bumped now. Beam has 'httplib2>=0.8,<0.18.0', as the new range now. (https://github.com/apache/beam/blob/8bedfd402ccd1336f2b40fad58cd5833cecb9638/sdks/python/setup.py#L150)

Do you remember what was the specific problem?

(/cc @tvalentyn in case he remembers.)

[tvalentyn]

Yes, no need to restrict this for Beam reasons anymore.
https://issues.apache.org/jira/browse/BEAM-9819 has some context for prior restrictions.

[busunkim96]

Thanks!

@tomchop Could you delete the comments on 38-40 about httplib2?

[tomchop]

@busunkim96 Done!

[busunkim96]

Thank you @tomchop!

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