Update deepmerge in group default to the latest version 🚀

[greenkeeper]

The dependency deepmerge was updated from 2.2.1 to 3.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[codecov-io]

Codecov Report

Merging #1639 into develop will decrease coverage by 0.18%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1639      +/-   ##
===========================================
- Coverage    74.93%   74.74%   -0.19%     
===========================================
  Files          439      439              
  Lines         7896     7896              
  Branches      1039     1039              
===========================================
- Hits          5917     5902      -15     
- Misses        1759     1771      +12     
- Partials       220      223       +3

Impacted Files	Coverage Δ
...p2p/lib/server/versions/internal/handlers/utils.js	80% <0%> (-20%)	⬇️
...es/core-p2p/lib/server/plugins/blockchain-ready.js	90% <0%> (-10%)	⬇️
packages/core-forger/lib/manager.js	71.84% <0%> (-8.74%)	⬇️
packages/core-forger/lib/client.js	78.84% <0%> (-1.93%)	⬇️
packages/core-blockchain/lib/state-machine.js	45.83% <0%> (-0.53%)	⬇️

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