Recreate atomic swap transactions on Testnet3#113

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imestin wants to merge 3 commits intodecred:masterfrom

imestin:testnet3

Commits on Jul 11, 2019

In README, links to Bitcoin testnet explorer were updated
imestin
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Commits on Jul 18, 2019

Change the testnet transaction details to testnet3 transactions
imestin
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Commits on Oct 21, 2019

Fix Decred raw transaction links
imestin
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