chore: upgraded the minimum supported version of python to 3.6

[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 #24 (b80a289) into master (6f75b94) will increase coverage by 1.53%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   87.88%   89.42%   +1.53%     
==========================================
  Files          37       37              
  Lines       22265    22265              
==========================================
+ Hits        19568    19910     +342     
+ Misses       2697     2355     -342     

Impacted Files	Coverage Δ
ibm_cloud_networking_services/common.py	100.00% <ø> (ø)
ibm_cloud_networking_services/zones_settings_v1.py	87.28% <0.00%> (+0.15%)	⬆️
ibm_cloud_networking_services/direct_link_v1.py	90.02% <0.00%> (+0.30%)	⬆️
...loud_networking_services/ssl_certificate_api_v1.py	87.50% <0.00%> (+0.53%)	⬆️
...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	90.38% <0.00%> (+1.00%)	⬆️
ibm_cloud_networking_services/zones_v1.py	89.20% <0.00%> (+1.07%)	⬆️
... and 24 more

---

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[ajay-malhotra1]

@KumarGanesanIBM Can you please check these build errors

[ajay-malhotra1]

🎉 This PR is included in version 0.4.2 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀