flow 0.2.0

• The LICENSE was switched from GPL-3 to MIT
• New function: flow_compare_runs() displays 2 calls on the same diagram, making it easy to
  observe their divergence
• New function: flow_view_uses() displays functions that recursively call its input, basically it
  does the opposite of flow_view_deps()
• New function: flow_view_source_calls() draws the dependencies between files sourcing each other.
• flow_view_deps() gains an include_formals arg, TRUE by default, so it
  displays dependencies used in formals.
• flow_view_deps() accepts a list of functions as input, to display a diagram
  that starts from several functions.
• flow_view_deps()'s trim, promote, demote, trim arguments support
  regular expressions.
• flow_view_doc() and flow_view_doc() were simplified to output only html since
  the md output was rarely used and brittle.
• flow_debugonce() is deprecated, use flow_debug() and flow_undebug()
• Diagram drawing functions now return by default a "flow_diagram" object, it
  contains the widget, the code and the data of the diagram and has a print()
  method that displays the diagram.
• Bug fixes

v0.1.0

We provide new experimental functions, these might be subjected to non trivial
breaking changes in the features and they have some known issues but we decided
to release them in the wild already:

• flow_view_vars() shows dependencies between variables within a function
• flow_view_deps() shows dependencies between functions in a given package
• flow_view_shiny() is a wrapper around flow_view_deps() to show only server
  and ui functions and functions that call them

These are introduced in vignette("experimental-functions")

Additionally :

• Various bug fixes, in particular vignettes and compatibility with older R versions