Utxo coins broadcasting

[ciripel]

• Add BCH, DASH, DGB, DOGE, FLUX & ZEC tx broadcast
• replaced deprecated getRecentBlockhash with getLatestBlockhash (will be dropped in solana v2.0

[codecov]

Codecov Report

Merging #25 (7e215e1) into master (8d43ee2) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          112       130   +18     
=========================================
+ Hits           112       130   +18     

Impacted Files	Coverage Δ
lib/src/broadcast.dart	100.00% <100.00%> (ø)
lib/src/build_transaction.dart	100.00% <100.00%> (ø)
lib/src/utils.dart	100.00% <100.00%> (ø)

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[ciripel]

close #18 #19 #20 #21 #22 #23