add failed tx's to undo buffer before raising

[iamdefinitelyahuman]

What I did

Add failing transactions to the undo buffer prior to raising.

Fixes a bug during coverage evaluation when an eth_call reverts.

How I did it

Move the raising logic out of TransactionReceipt.__init__ and into a private method that is called after appending to the undo buffer.

How to verify it

Run tests.

[codecov-io]

Codecov Report

Merging #524 into master will decrease coverage by 0.03%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #524      +/-   ##
==========================================
- Coverage   88.51%   88.47%   -0.04%     
==========================================
  Files          56       56              
  Lines        6208     6213       +5     
  Branches     1373     1373              
==========================================
+ Hits         5495     5497       +2     
- Misses        489      491       +2     
- Partials      224      225       +1     

Impacted Files	Coverage Δ
brownie/network/transaction.py	86.95% <63.63%> (-0.57%)	⬇️
brownie/network/account.py	93.42% <100.00%> (+0.08%)	⬆️

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