Fix deprecations (#111)

* Fix deprecations

* Remove superfluous comment left over by FemtoCleaner

Author: femtocleaner[bot]

src/gamma.jl

@@ -540,8 +540,6 @@ function polygamma(m::Integer, z::Number)
     polygamma(m, x)
 end
 
-@static if VERSION >= v"0.7.0-alpha.69"
-
 export gamma, lgamma, beta, lbeta, lfactorial
 
 ## from base/special/gamma.jl
@@ -762,14 +760,6 @@ end
 factorial(x) = Base.factorial(x) # to make SpecialFunctions.factorial work unconditionally
 factorial(x::Number) = gamma(x + 1) # fallback for x not Integer
 
-else # @static if
-
-import Base: gamma, lgamma, beta, lbeta, lfact
-const lfactorial = lfact
-export lfactorial
-
-end # @static if
-
 """
     lbinomial(n, k) = log(abs(binomial(n, k)))