Fixes this warning:
WARN: Setting attributes without specifying a precedence is deprecated and will be
removed in Chef 11.0. To set attributes at normal precedence, change code like:
`node["key"] = "value"` # Not this
`node.set["key"] = "value"` # This
Also resolves #5
set attributes from recipes in a chef 11-compatible way
Oops, missed this earlier. Thanks for the PR!