[Snyk] Upgrade ethereumjs-tx from 1.3.3 to 1.3.7

[snyk-bot]

Snyk has created this PR to upgrade ethereumjs-tx from 1.3.3 to 1.3.7.

• The recommended version is 4 versions ahead of your current version.
• The recommended version was released a year ago, on 2018-07-25.

Release notes

• 1.3.7 - 2018-07-25
  • Fix bug causing FakeTransaction.from to not retrieve sender address from tx signature, see PR #118
• 1.3.6 - 2018-07-02
  • Fixes issue #108 with the FakeTransaction.hash() function by reverting the introduced signature handling changes in Fake transaction hash creation from PR #94 introduced in v1.3.5. The signature is now again only created and added to the hash when from address is set and from is not defaulting to the zero adress any more, see PR #110
  • Added additional tests to cover issue described above
• 1.3.5 - 2018-06-22
  • Include signature by default in FakeTransaction.hash, PR #97
  • Fix FakeTransaction signature failure bug, PR #94
• 1.3.4 - 2018-03-07
  • Fix a bug producing hash collisions on FakeTransaction for different senders, PR #81
  • Switched from deprecated es2015 to env babel preset, PR #86
  • Dropped Node 4 support
• 1.3.3 - 2017-07-12
  • Allow zeros in v,r,s signature values
  • Dropped browserify transform from package.json
  • (combined v1.3.3 and v1.3.2 release notes)

from ethereumjs-tx GitHub Release Notes

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