v0.18.5

ContinuumArrays v0.18.5

Diff since v0.18.4

Merged pull requests:

• Give index information to BoundsError in getindex for splines (#188) (@DanielVandH)
• Fix docstring in plotgrid (#189) (@DanielVandH)
• Fix missing docstring for Map (#190) (@DanielVandH)
• Expand functions in P'(x .^2 .* P) (#191) (@dlfivefifty)