all: release 0.4.0

[mmcloughlin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #130 (32936fb) into master (6a7d3de) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #130   +/-   ##
=======================================
  Coverage   74.01%   74.01%           
=======================================
  Files          35       35           
  Lines        2078     2078           
=======================================
  Hits         1538     1538           
  Misses        474      474           
  Partials       66       66           

Flag	Coverage Δ
unittests	74.01% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/examples/fp25519/inv.go	100.00% <100.00%> (ø)

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