Lock bitflags to < 1.3.0 to fix the build with rust < 1.46.0

Issue #1491

Author: asomers

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
+This project adheres to [Semantic Versioning](https://semver.org/).
+
+## [Unreleased] - ReleaseDate
+### Added
+### Changed
+### Fixed
+
+- Locked bitflags to < 1.3.0 to fix the build with rust < 1.46.0.
+
+### Removed
 
 ## [0.20.0] - 20 February 2021
 ### Added

Cargo.toml

@@ -32,7 +32,7 @@ targets = [
 
 [dependencies]
 libc = { version = "0.2.82", features = [ "extra_traits" ] }
-bitflags = "1.1"
+bitflags = ">= 1.1.0, < 1.3.0"
 cfg-if = "1.0"
 
 [target.'cfg(target_os = "dragonfly")'.build-dependencies]