Upgrade rust/crates/bitflags to 1.3.2

Test: make
Change-Id: I3f6842fc0ca1ef3490bcc0f3f5790d5f025c34b5
diff --git a/README.md b/README.md
index df12934..0da0f85 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,10 @@
 bitflags
 ========
 
-[![Build Status](https://travis-ci.com/bitflags/bitflags.svg?branch=master)](https://travis-ci.com/bitflags/bitflags)
+[![Rust](https://github.com/bitflags/bitflags/workflows/Rust/badge.svg)](https://github.com/bitflags/bitflags/actions)
 [![Join the chat at https://gitter.im/bitflags/Lobby](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/bitflags/Lobby?utm_source=badge&utm_medium=badge&utm_content=badge)
 [![Latest version](https://img.shields.io/crates/v/bitflags.svg)](https://crates.io/crates/bitflags)
 [![Documentation](https://docs.rs/bitflags/badge.svg)](https://docs.rs/bitflags)
-![Minimum rustc version](https://img.shields.io/badge/rustc-1.20+-yellow.svg)
 ![License](https://img.shields.io/crates/l/bitflags.svg)
 
 A Rust macro to generate structures which behave like a set of bitflags
@@ -19,16 +18,15 @@
 
 ```toml
 [dependencies]
-bitflags = "1.0"
+bitflags = "1.3"
 ```
 
-and this to your crate root:
+and this to your source code:
 
 ```rust
-#[macro_use]
-extern crate bitflags;
+use bitflags::bitflags;
 ```
 
 ## Rust Version Support
 
-The minimum supported Rust version is 1.20 due to use of associated constants.
+The minimum supported Rust version is 1.46 due to use of associated constants and const functions.