Add SES Event Info

[kolanos]

Closes #294

[codecov]

Codecov Report

Merging #331 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
+ Coverage   83.56%   83.64%   +0.07%     
==========================================
  Files          36       36              
  Lines        1351     1357       +6     
==========================================
+ Hits         1129     1135       +6     
  Misses        222      222

Impacted Files	Coverage Δ
iopipe/contrib/eventinfo/event_types.py	100% <100%> (ø)	⬆️

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