Update README.md

Author: kose-y

README.md

@@ -12,13 +12,12 @@ This package requires Julia v0.7.0 or later, which can be obtained from
 https://julialang.org/downloads/ or by building Julia from the sources in the
 https://github.com/JuliaLang/julia repository.
 
-The package has not yet been registered and must be installed using the repository location.
-Start julia and use the `]` key to switch to the package manager REPL
+
+This package is registered in the default Julia package registry, and can be installed through standard package installation procedure: e.g., running the following code in Julia REPL.
 ```julia
-(v1.2) pkg> add https://github.com/OpenMendel/VarianceComponentModels.jl
+using Pkg
+pkg"add VarianceComponentModels"
 ```
-Use the backspace key to return to the Julia REPL.
-
 ## Citation
 
 If you use [OpenMendel](https://openmendel.github.io) analysis packages in your research, please cite the following reference in the resulting publications: