Bump rust-bitcoin and friends

[TheBlueMatt]

This is the last step towards getting #618 merged!

[codecov]

Codecov Report

Merging #686 into master will increase coverage by 0.00%.
The diff coverage is 99.31%.

@@           Coverage Diff           @@
##           master     #686   +/-   ##
=======================================
  Coverage   91.38%   91.38%           
=======================================
  Files          35       35           
  Lines       21724    21727    +3     
=======================================
+ Hits        19852    19855    +3     
  Misses       1872     1872           

Impacted Files	Coverage Δ
lightning/src/ln/channel.rs	87.20% <92.85%> (ø)
lightning/src/chain/chaininterface.rs	91.93% <100.00%> (ø)
lightning/src/chain/keysinterface.rs	94.84% <100.00%> (ø)
lightning/src/ln/chan_utils.rs	95.97% <100.00%> (ø)
lightning/src/ln/channelmanager.rs	85.27% <100.00%> (ø)
lightning/src/ln/channelmonitor.rs	95.49% <100.00%> (ø)
lightning/src/ln/functional_test_utils.rs	94.81% <100.00%> (ø)
lightning/src/ln/functional_tests.rs	97.15% <100.00%> (ø)
lightning/src/ln/msgs.rs	90.33% <100.00%> (+0.02%)	⬆️
lightning/src/ln/reorg_tests.rs	98.94% <100.00%> (ø)
... and 4 more

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[valentinewallace]

LGTM! 🥇 and nice on upgrading to the less error-prone API.