unhandled exception connection closed before PR has been made [ProtocolError]

```bash
~> nimble publish           
      Info: Using GitHub API Token in file: /home/xmonader/.nimble/github_api_token
   Success: Verified as xmonader
    Copying packages fork into: /tmp/nimble-packages-fork
   Updating the fork
    Prompt: Whitespace separated list of tags?
    Answer: assets bundle go-bindata resources
    Pushing to remote of fork.
       Info Creating PR
nimble.nim(1106)         nimble
nimble.nim(1071)         doAction
publish.nim(225)         publish
publish.nim(101)         createPullRequest
httpclient.nim(1294)     postContent
httpclient.nim(1273)     post
httpclient.nim(1189)     requestAux
httpclient.nim(1065)     parseResponse
httpclient.nim(228)      httpError
Error: unhandled exception: Connection was closed before full request has been made [ProtocolError]
```