Update DynamoDB and EFS limits

[bergkampsliew]

There were two AWS announcements to increase the limits for EFS and DDB as below.
https://aws.amazon.com/about-aws/whats-new/2018/12/amazon-dynamodb-increases-the-number-of-global-secondary-indexes-and-projected-index-attributes-you-can-create-per-table/
and
https://aws.amazon.com/about-aws/whats-new/2018/11/amazon-efs-now-supports-1000-file-systems-per-account/
awslimitchecker is currently not updated with the new values.

Version

6.1.2
(and reproducible using develop branch)

Installation Method

pip, without virtualenv

Supporting Software Versions

python 2.7.9
(and also python 3.5.3 when testing with develop branch)

Actual Output

for example, below is a dynamodb warning alert, same goes with EFS check.
...
DynamoDB/Global Secondary Indexes (limit 5) WARNING: xxxxxxxxx-table=4
...

Expected Output

awslimitchecker should use correct values to check for the limits and alert accordingly.

TrustedAdvisor

Testing Assistance

will make a PR after tested locally

[jantman]

This has been released as 6.1.3 via #393 and is now live on PyPI.

Thank you so much for the contribution!