Use updated go-ses with aws4 signing, remove unnecessary method from …

[bserdar]

…asw interface

[codecov-commenter]

Codecov Report

Merging #2 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #2      +/-   ##
==========================================
+ Coverage   95.75%   95.77%   +0.01%     
==========================================
  Files           6        6              
  Lines         283      284       +1     
==========================================
+ Hits          271      272       +1     
  Misses          6        6              
  Partials        6        6              

Impacted Files	Coverage Δ
aws_ses.go	95.00% <ø> (ø)
config.go	100.00% <100.00%> (ø)

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[mrz1836]

See my comment about the SendRawEmail vs SendEmail