fix: run integration tests on Python 3.5

[ajay-malhotra1]

PR summary

Fixes: <! -- link to issue -->

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[codecov]

Codecov Report

Merging #11 into master will increase coverage by 1.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   87.75%   88.94%   +1.19%     
==========================================
  Files          34       34              
  Lines       17799    17799              
==========================================
+ Hits        15620    15832     +212     
+ Misses       2179     1967     -212     

Impacted Files	Coverage Δ
ibm_cloud_networking_services/zones_settings_v1.py	87.28% <0.00%> (+0.15%)	⬆️
ibm_cloud_networking_services/direct_link_v1.py	90.11% <0.00%> (+0.41%)	⬆️
...loud_networking_services/ssl_certificate_api_v1.py	87.63% <0.00%> (+0.55%)	⬆️
...m_cloud_networking_services/zone_rate_limits_v1.py	88.86% <0.00%> (+0.58%)	⬆️
...oud_networking_services/transit_gateway_apis_v1.py	90.99% <0.00%> (+0.75%)	⬆️
...ud_networking_services/firewall_access_rules_v1.py	88.65% <0.00%> (+0.96%)	⬆️
ibm_cloud_networking_services/caching_api_v1.py	90.18% <0.00%> (+0.99%)	⬆️
...tworking_services/global_load_balancer_pools_v0.py	89.76% <0.00%> (+1.06%)	⬆️
ibm_cloud_networking_services/zones_v1.py	89.20% <0.00%> (+1.07%)	⬆️
...tworking_services/zone_firewall_access_rules_v1.py	88.35% <0.00%> (+1.14%)	⬆️
... and 21 more

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[ajay-malhotra1]

🎉 This PR is included in version 0.1.1 🎉

The release is available on GitHub release

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