"guzzlehttp/promises": "~2.0" #174

[addshore]

[samwilson]

Given that addwiki's usage of this is backwards compatible with v1, should this use ~1.0 || ^2.0 instead of just ^2.0 on its own? (As suggested on the issue.) It seems like the sort of package that is likely to be a dependency of other packages and so having the most flexibility might be better (given nothing needs to be changed to the code here to accommodate that anyway).