FIX: DOC: Set size_threshold to nothing (#295)

* FIX: DOC: Set `size_threshold` to `nothing`

Try to fix #292

* Add a comma

* Set `size_threshold` in `Documenter.HTML`

Author: oyamad

docs/make.jl

@@ -2,7 +2,7 @@ using Documenter, QuantEcon
 
 makedocs(
     modules = [QuantEcon],
-    format = Documenter.HTML(prettyurls = false),
+    format = Documenter.HTML(prettyurls = false, size_threshold = nothing),
     sitename = "QuantEcon.jl",
     pages = Any[ # Compat: `Any` for 0.4 compat
         "Home" => "index.md",