Fix #15

[sc0Vu]

Change

• Change nonce, gas, gasLimit, gasPrice allowZero to false.
• Change check zero statement.
• Add test for issue The 0x00 nonce error #15.

[codecov-io]

Codecov Report

Merging #16 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #16   +/-   ##
=========================================
  Coverage     86.56%   86.56%           
+ Complexity       67       64    -3     
=========================================
  Files             1        1           
  Lines           134      134           
=========================================
  Hits            116      116           
  Misses           18       18

Impacted Files	Coverage Δ	Complexity Δ
src/Transaction.php	86.56% <100%> (ø)	64 <0> (-3)	⬇️

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