Pin boto3 to 1.4.7

[jeffreythewang]

Since botocore is pinned to botocore>=1.7.0, <1.8.0 as per #5184 , boto3 should also be pinned, as boto3==1.4.6 depends on botocore>=1.6.0, <1.7.0 and boto3==1.4.8 depends on botocore>=1.8.0, <1.9.0.

cc: @mistercrunch @ledor473 @john-bodley

[codecov-io]

Codecov Report

Merging #5290 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #5290   +/-   ##
======================================
  Coverage    61.3%   61.3%           
======================================
  Files         368     368           
  Lines       23453   23453           
  Branches     2713    2713           
======================================
  Hits        14378   14378           
  Misses       9063    9063           
  Partials       12      12

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[williaster]

I made this change and it fixed my local build. not sure if this is better or #5286 (didn't test that one)

[jeffreythewang]

Yeah tbh we don't use either of these libraries so I don't know if we should have the final say on this one. But if we're going to pin botocore to anything, we'll have to pin boto3 as well. It seems like #5286 requires boto3==1.4.8.

[mistercrunch]

Ok let me merge this, we can iterate if needed.