print() is a function in Python 3

[Christian Clauss]

flake8 testing of https://github.com/google/cocoapods-size on Python 3.7.0

$ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

./xcode_project_diff.py:168:35: E999 SyntaxError: invalid syntax
    print '{} is {} larger than {}'.format(args.source_project, diff_size,
                                  ^
./measure_cocoapod_size.py:121:57: E999 SyntaxError: invalid syntax
  print 'The pods combined add an extra size of {} bytes'.format(
                                                        ^
2     E999 SyntaxError: invalid syntax
2

[Vinay Guthal]

Thanks for raising 👍
Updated the script to work for python3