Multispec and welch with only one non-overlapping segment should have identical frequency resolutions

[Robert Guggenberger]

using Multitaper
x = range(0.001, stop=1,length=1000)
y = sin.(x * 10 * 2 * pi)
M = multispec(y)
W, bandwidth = welch(y, 1)
@assert W.f == M.f

‌

[Charlotte Haley]

Thank you for catching this. [Commit 2519b2c](https://bitbucket.org/clhaley/multitaper.jl/commits/2519b2c5af37b2fbaa28b443689bf76646f7ad6a) addresses the error.