add version & action in rpc header

[peze]

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[codecov]

Codecov Report

Merging #79 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #79   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          253       253           
=========================================
  Hits           253       253           

Impacted Files	Coverage Δ
lib/rpc.js	100.00% <ø> (ø)

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