Miss using FiniteDiff

[JSun950313]

Dojo.jl/examples/trajectory_optimization/quadruped_min.jl

Line 38 in ad046e5

xref = quadruped_trajectory(env.mechanism,

When I ran this script, REPL reported an error that said FiniteDiff is undefined. I think the code missed using the package of FiniteDiff.

[thowell]

FiniteDiff is now added to examples dependencies. Thanks!