Shard does not install using the example from README.md

[SeedyROM]

Trying to run shards install on my shard.yml fails when I have the crystal-dfa added as a dependency.

shard.yml:

# Default config...
dependencies:
  crystal-dfa:
    github: ziprandom/crystal-dfa
# Other dependencies...

$ shards install:

Fetching https://github.com/ziprandom/crystal-dfa.git
Installing crystal-dfa (0.4.1)
Failed git ls-tree -r --full-tree --name-only  -- shard.yml (). Maybe a commit, branch or file doesn't exist?

(Not entirely sure what that error even means, sorry if I'm completely clueless!)

I'm just playing around with parser generators in my new favorite language!

[jrester]

I got the same error when first installing cltk, removing it and adding crystal-dfa to dependencies, but deleting shard.lock fixed that error.

It seems to be an issue with the version tag as it is mentioned here.