Merge branch 'release/v0.5.0' into develop

* release/v0.5.0:
  Bumps version
Remove pry from development dependencies
- Add pry to gemfile
- Fix pry to specific version to avoid CodeRay parse errors
Handle -6 error
bumps version
Merge branch 'release/v0.6.0'

* release/v0.6.0:
  bumps version
  Handle -6 error
  Remove pry from development dependencies - Add pry to gemfile - Fix pry to specific version to avoid CodeRay parse errors
Merge branch 'release/v0.6.0' into develop

* release/v0.6.0:
  bumps version
Expose Wallet#client
- others refer to this method on the wallet
Wrap test in module for shorter constant names
Upgrade bitcoin testnet and get specs passing
Re-run all specs with vcr recording
Update changelog
Updates version
Merge branch 'release/v0.6.1'

* release/v0.6.1:
  Updates version
  Update changelog
  Re-run all specs with vcr recording
  Upgrade bitcoin testnet and get specs passing
  Wrap test in module for shorter constant names
  Expose Wallet#client - others refer to this method on the wallet