tUpdate text on documentation landing page - Granular.jl - Julia package for granular dynamics simulation
 (HTM) git clone git://src.adamsgaard.dk/Granular.jl
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 (DIR) README
 (DIR) LICENSE
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 (HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
       Date:   Wed,  9 May 2018 11:32:34 -0400
       
       Update text on documentation landing page
       
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        # Granular.jl
        
       -*A [Julia](https://julialang.org) package for particle-based simulation of 
       -granular dynamics.*
       +**A [Julia](https://julialang.org) package for particle-based simulation of 
       +granular materials.**
        
        `Granular.jl` is a flexible and computationally efficient 2d implementation of 
        the discrete element method.  Grains are represented as particles, which can be 
        forced by drag in fluid grids.  The grains interact through 
        elasto-viscous-frictional contact rheologies and can obtain time-dependent 
       -tensile strength.
       +cohesive strength with bond mechanics based on beam theory.
        
        The source code for Granular.jl is hosted on [Github](https://github.com/anders-dc/Granular.jl).