Fix Features.toString

[pm47]

No description provided.

[codecov-io]

Codecov Report

Merging #1573 into master will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1573      +/-   ##
==========================================
+ Coverage   87.25%   87.28%   +0.03%     
==========================================
  Files         139      139              
  Lines       10923    10926       +3     
  Branches      461      466       +5     
==========================================
+ Hits         9531     9537       +6     
+ Misses       1392     1389       -3     

Impacted Files	Coverage Δ
...core/src/main/scala/fr/acinq/eclair/Features.scala	99.06% <100.00%> (ø)
...cala/fr/acinq/eclair/payment/relay/NodeRelay.scala	93.70% <0.00%> (-1.58%)	⬇️
.../scala/fr/acinq/eclair/payment/PaymentPacket.scala	91.42% <0.00%> (-0.76%)	⬇️
.../fr/acinq/eclair/transactions/CommitmentSpec.scala	82.92% <0.00%> (-0.41%)	⬇️
...nq/eclair/blockchain/electrum/ElectrumWallet.scala	80.51% <0.00%> (+0.25%)	⬆️
...in/scala/fr/acinq/eclair/channel/Commitments.scala	93.91% <0.00%> (+0.28%)	⬆️
.../scala/fr/acinq/eclair/payment/relay/Relayer.scala	89.47% <0.00%> (+0.58%)	⬆️
.../eclair/payment/relay/PostRestartHtlcCleaner.scala	90.38% <0.00%> (+1.28%)	⬆️
...q/eclair/blockchain/electrum/ElectrumWatcher.scala	76.98% <0.00%> (+1.58%)	⬆️