Update README.md

Author: dralletje

README.md

@@ -14,17 +14,7 @@ A macro `@test` that you can use to verify your code's correctness. **But instea
 
 # Install & use
 
-First, update Pluto to at least `0.14.5`! Next, add this package like so: _(you can skip this step in Pluto 0.15 and above)_
-
-```julia
-julia> begin
-           import Pkg
-           Pkg.activate(mktempdir())
-           Pkg.add([
-               Pkg.PackageSpec(name="PlutoTest")
-           ])
-       end
-```
+First, update Pluto to at least `0.15`! That's it, Pluto will automatically install the package when you `import`/`using` it.
 
 Inside your notebook, use the `@test` macro to test whether something returns `true`: