updated rvm plan to 2.7

README.md

@@ -31,7 +31,7 @@ To use this website, the following steps are necessary:
 
 # Basic use:
 
-rvm use ruby 2.6 # on M1 install with rvm install 2.6.6 --with-gcc=clang
+rvm use ruby 2.7 # on M1 install with rvm install 2.7
 
 bundle install # if needed