Replace c3.large with c5.large (#237)
Replace c3.large with c5.large (#237)

c3 has been deprecated. These longer exists in us-east-1. c5 has been rolled out to more locations and should have more longevity:
https://aws.amazon.com/about-aws/whats-new/2019/08/amazon-ec2-c5-new-instance-sizes-are-now-available-in-additional-regions/

CPU/RAM were 2/3.75 GB for C3 and are 2/4GB for C5.
https://aws.amazon.com/ec2/previous-generation/
https://aws.amazon.com/blogs/aws/now-available-compute-intensive-c5-instances-for-amazon-ec2/
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