MAINT: Update README.md (#774)

Author: oyamad

README.md

@@ -17,7 +17,7 @@ A high performance, open source Python code library for economics
 
 ## Installation
 
-Before installing `quantecon` we recommend you install the [Anaconda](https://www.anaconda.com/download/) Python distribution, which includes a full suite of scientific python tools. **Note:** `quantecon` is now only supporting Python version 3.5+. This is mainly to allow code to be written taking full advantage of new features such as using the `@` symbol for matrix multiplication. Therefore please install the latest Python 3 Anaconda distribution.
+Before installing `quantecon` we recommend you install the [Anaconda](https://www.anaconda.com/download/) Python distribution, which includes a full suite of scientific python tools.
 
 Next you can install quantecon by opening a terminal prompt and typing