Changed install link (#20599)
Changed install link (#20599)

changed version of installation link for version 3 (most popular) and instalation via bower and npm
BhaveshSGupta/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp,raisedadead/FreeCodeCamp,jonathanihm/freeCodeCamp,jonathanihm/freeCodeCamp,raisedadead/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp