raise MSRV to 1.46

bitflags in lexical will not compile below 1.46

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - 1.44.0
+          - 1.46.0
 
         features:
           - ''

README.md

@@ -5,7 +5,7 @@
 [![Build Status](https://travis-ci.org/Geal/nom.svg?branch=master)](https://travis-ci.org/Geal/nom)
 [![Coverage Status](https://coveralls.io/repos/Geal/nom/badge.svg?branch=master)](https://coveralls.io/r/Geal/nom?branch=master)
 [![Crates.io Version](https://img.shields.io/crates/v/nom.svg)](https://crates.io/crates/nom)
-[![Minimum rustc version](https://img.shields.io/badge/rustc-1.44.0+-lightgray.svg)](#rust-version-requirements)
+[![Minimum rustc version](https://img.shields.io/badge/rustc-1.46.0+-lightgray.svg)](#rust-version-requirements)
 
 nom is a parser combinators library written in Rust. Its goal is to provide tools
 to build safe parsers without compromising the speed or memory consumption. To
@@ -188,10 +188,9 @@ Some benchmarks are available on [Github](https://github.com/Geal/nom_benchmarks
 
 ## Rust version requirements
 
-The 6.0 series of nom requires **Rustc version 1.44 or greater**, but it can change for some feature combinations:
+The 7.0 series of nom requires **Rustc version 1.46 or greater**, but it can change for some feature combinations:
 - compatible with 1.41.1 if building without the `lexical` feature, ie `--no-default-features --features std`
 
-Travis CI always has a build with a pinned version of Rustc matching the oldest supported Rust release.
 The current policy is that this will only be updated in the next major nom release.
 
 ## Installation