Make org.web3j.crypto.Sign.SignatureData public.

[eztierney]

This Sign methods that have SignatureData in the method signature are now callable from other packages.

[codecov-io]

Codecov Report

Merging #65 into master will not change coverage.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master      #65   +/-   ##
=========================================
  Coverage     80.01%   80.01%           
  Complexity     1138     1138           
=========================================
  Files           165      165           
  Lines          3987     3987           
  Branches        515      515           
=========================================
  Hits           3190     3190           
  Misses          660      660           
  Partials        137      137

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/web3j/crypto/Sign.java	70% <0%> (ø)	12 <0> (ø)	❌

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[conor10]

Thanks.