[minor] Updated the aws-sdk dependency, switch to go mod and update go version

[edify42]

Hey @cmattoon

As per the linked issue here: https://github.com/cmattoon/aws-ssm/issues/43

I want to update the aws-sdk dependency used. I went ahead and did a few more updates (switching to go1.14 and go mod) as I felt the repo needed a bit of ❤️

Could be considered a major version update, I never ran the original source code so I'm not 100% sure if something has broken/changed.

[codecov[bot]]

Codecov Report

Merging #44 into master will not change coverage. The diff coverage is 0%.

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   47.57%   47.57%           
=======================================
  Files           4        4           
  Lines         206      206           
=======================================
  Hits           98       98           
  Misses        105      105           
  Partials        3        3

Impacted Files	Coverage Δ
pkg/controller/controller.go	0% <0%> (ø)	:arrow_up:

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