chore(rustc): bump MSRV

Author: kpp

.github/workflows/rust.yml

@@ -14,7 +14,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         rust:
           - stable
-          - 1.60
+          - 1.61
     steps:
     - uses: actions/checkout@v2
     - uses: actions-rs/toolchain@v1

README.md

@@ -30,7 +30,7 @@ issue / pull request should be filled on the reference repository.
 [CONTRIBUTING.md](/CONTRIBUTING.md).
 
 ## Building
-Fairly simple. First, install [Rust] >= 1.60 and a C compiler ([Build Tools
+Fairly simple. First, install [Rust] >= 1.61 and a C compiler ([Build Tools
 for Visual Studio][VSBuild] on Windows, GCC or Clang on other platforms).
 
 Then you can build the debug version with

tox_node/README.md

@@ -4,7 +4,7 @@ A server application to run tox bootstrap node.
 
 ## Building and running
 
-You'll need [Rust] >= 1.60.
+You'll need [Rust] >= 1.61.
 
 Build with: