A simple question about versions

[ShinyFabio]

Hello,
I'm using your fantastic package to build a shiny package and it helped me a lot since it's my first github package. I have just a question. I noticed that on GitHub there is the 0.3 while from CRAN the 0.2.1. In the beginning I didn't notice that and I installed it from GitHub and I made my shiny package. But then I moved to the cran version (still not sure if it was a good or bad idea...i though was better to have everything from cran). To do this I deleted the first version and made it again from the beginning. However my question is: since now I made the package with the 0.2.1 version, when the 0.3 will be released also on CRAN, what does it involve? Should I build the package again from the beginning in order to use the new functionalities, or there is a easier way? Thank you in advance and sorry if it's a stupid question.