me-south-1 availability zones

[PatMyron]

https://aws.amazon.com/blogs/aws/now-open-aws-middle-east-bahrain/
https://aws.amazon.com/about-aws/whats-new/2019/07/announcing-the-new-aws-middle-east--bahrain--region-/

aws ec2 describe-availability-zones --region me-south-1 | grep '"ZoneName"'
            "ZoneName": "me-south-1a",
            "ZoneName": "me-south-1b",
            "ZoneName": "me-south-1c",

REGIONS updated here: #1113
SPEC_REGIONS updated here: #1095

[codecov]

Codecov Report

Merging #1070 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1070   +/-   ##
=======================================
  Coverage   86.91%   86.91%           
=======================================
  Files         134      134           
  Lines        7930     7930           
  Branches     1952     1952           
=======================================
  Hits         6892     6892           
  Misses        641      641           
  Partials      397      397

Impacted Files	Coverage Δ
src/cfnlint/helpers.py	85.03% <ø> (ø)	⬆️

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