Fix installation process steps (#443)

I had to do this to avoid the error message Pkg.update ERROR: UndefVarError: Pkg not defined which was resolved by julia> using Pkg beforehand.
jump-dev · Jun 5, 2021 · feacb66 · feacb66
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commit feacb66
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diff --git a/docs/src/installation.md b/docs/src/installation.md
@@ -4,6 +4,7 @@ Installation
 Installing Convex.jl is a one step process. Open up Julia and type :
 
 ```julia
+using Pkg
 Pkg.update()
 Pkg.add("Convex")
 ```