Use `cis(a)` rather than `exp(im*a)`

[Oscar Smith]

It's 24% faster and at least as accurate.

[Oscar Smith]

Similarly, mod2pi(a) should be used instead of mod(a, 2pi).

[Philipp Berens]

tagging @babaq

[Li Alex Zhang]

issue solved in #7
@philippberens after merging, and package registration completion, you can use the same JuliaHub register page to publish this v1.0.1 version.

[Li Alex Zhang]

@philippberens The v1.0.0 version have been accepted in general Julia package registry!

Now, you can publish the current version v1.0.1