add AGNNConv

[CarloLucibello]

No description provided.

[codecov]

Codecov Report

Merging #68 (c2a1642) into master (651f761) will increase coverage by 0.20%.
The diff coverage is 86.36%.

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   79.89%   80.10%   +0.20%     
==========================================
  Files          12       12              
  Lines         781      794      +13     
==========================================
+ Hits          624      636      +12     
- Misses        157      158       +1     

Impacted Files	Coverage Δ
src/deprecations.jl	90.00% <ø> (ø)
src/msgpass.jl	83.33% <50.00%> (-2.39%)	⬇️
src/layers/conv.jl	75.31% <100.00%> (+1.19%)	⬆️

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