Remove warnings (#9)

Author: amontoison

src/Quadmath.jl

@@ -70,7 +70,7 @@ end
 
 function __init__()
     @require SpecialFunctions="276daf66-3868-5448-9aa4-cd146d93841b" begin
-        using SpecialFunctions
+        import .SpecialFunctions
 
         SpecialFunctions.erf(x::Float128) = Float128(ccall((:erfq, libquadmath), Cfloat128, (Cfloat128, ), x))
         SpecialFunctions.erfc(x::Float128) = Float128(ccall((:erfcq, libquadmath), Cfloat128, (Cfloat128, ), x))
@@ -322,4 +322,4 @@ end
 print(io::IO, b::Float128) = print(io, string(b))
 show(io::IO, b::Float128) = print(io, string(b))
 
-end # modeule Quadmath
+end # module Quadmath