Update README.md [ci skip]

Author: ericphanson

README.md

@@ -15,6 +15,8 @@
 
 ## Quick Example
 
+Note: the following example uses the syntax of the master branch of Convex.jl. See the [stable docs](https://www.juliaopt.org/Convex.jl/stable) for examples for the current release.
+
 To run this example, first install Convex and at least one solver, such as SCS:
 ```julia
 using Pkg