tadd docstring on `reverse` arguemnt - Granular.jl - Julia package for granular dynamics simulation
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       ---
 (DIR) commit 792436c6aa59c8b3e530d570d02517f3d782da23
 (DIR) parent a48448c33e150c60f6050172db30191e3b455c84
 (HTM) Author: Anders Damsgaard <andersd@riseup.net>
       Date:   Wed,  1 Nov 2017 14:01:54 -0400
       
       add docstring on `reverse` arguemnt
       
       Diffstat:
         M src/io.jl                           |       2 ++
       
       1 file changed, 2 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/src/io.jl b/src/io.jl
       t@@ -921,6 +921,8 @@ from the shell using the supplied `pvpython` argument.
            script uses the pvpython in the system PATH.
        * `images::Bool`: render images to disk (default: true)
        * `animation::Bool`: render animation to disk (default: false)
       +* `reverse::Bool`: if `images=true` additionally render reverse-animated gif
       +    (default: false)
        """
        function render(simulation::Simulation; pvpython::String="pvpython",
                        images::Bool=true,