chore: update minimal rust version

Author: kurnevsky

.github/workflows/rust.yml

@@ -14,7 +14,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         rust:
           - stable
-          - 1.42.0
+          - 1.51.0
     steps:
     - uses: actions/checkout@v2
     - uses: actions-rs/toolchain@v1

README.md

@@ -4,7 +4,7 @@ A server application to run tox bootstrap node.
 
 ## Building and running
 
-You'll need [Rust] >= 1.42.0.
+You'll need [Rust] >= 1.51.0.
 
 Build with: