Fix return type of meanexcess when only one integer is passed

Author: juliohm

README.md

@@ -75,6 +75,9 @@ A few statistics are defined:
 ```julia
 # return statistics
 returnlevels(xs)
+
+# mean excess with previous k values
+meanexcess(xs, k)
 ```
 
 ## References

src/stats.jl

@@ -38,7 +38,7 @@ end
 
 Return mean excess of the data `xs` using previous `k` values.
 """
-meanexcess(xs::AbstractVector, k::Int) = meanexcess(xs, [k])
+meanexcess(xs::AbstractVector, k::Int) = meanexcess(xs, [k])[1]
 
 function meanexcess(xs::AbstractVector, ks::AbstractVector{Int})
   ys = sort(xs, rev=true)