Build documentation with Documenter 0.26 (#179)

Author: giordano

docs/Project.toml

@@ -2,4 +2,4 @@
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 
 [compat]
-Documenter = "~0.22"
+Documenter = "~0.26"

docs/make.jl

@@ -3,7 +3,6 @@ using Documenter, FFTW
 makedocs(
     modules = [FFTW],
     clean = false,
-    format = :html,
     sitename = "FFTW.jl",
     pages = Any[
         "Home" => "index.md",
@@ -12,7 +11,6 @@ makedocs(
 )
 
 deploydocs(
-    julia = "nightly",
     repo = "github.com/JuliaMath/FFTW.jl.git",
     target = "build",
     deps = nothing,