Add .onLoad warning for old versions of broom

DeclareDesign / estimatr

estimatr: Fast Estimators for Design-Based Inference

https://declaredesign.org/r/estimatr

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Add .onLoad warning for old versions of broom #265

Closed lukesonnet closed 6 years ago

lukesonnet commented 6 years ago

This PR will packageStartupMessage if broom version <= 0.5.0, the current CRAN version, is attached. If they attach broom afterwards, there's no guarantee.

Hopefully the broom that relies on generics will be on CRAN soon.

This also tests the message is silent if the right version of broom is installed and that it messages with the old version. Travis hopefully is set up to test both on Linux, release R.

lukesonnet commented 6 years ago

Also looks like Travis fixed their Fortran problem!