doc: added MSRV information + removed old fuzzit parts

Closes #671

.github/workflows/ci.yml

@@ -130,40 +130,3 @@ jobs:
           name: pest-ci-coverage
           fail_ci_if_error: false
           verbose: true
-
-# fuzzing: # fuzzit is now offline
-#   name: Fuzz Testing
-#   runs-on: ubuntu-latest
-#   if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
-#   steps:
-#     - name: Checkout source code
-#       uses: actions/checkout@v2
-#     - name: Install Rust Nightly
-#       uses: actions-rs/toolchain@v1
-#       with:
-#         toolchain: nightly
-#         default: true
-#     - name: Install Cargo Fuzz
-#       uses: actions-rs/install@v0.1
-#       with:
-#         crate: cargo-fuzz
-#         version: latest
-#         use-tool-cache: true
-#     - name: Bootstraping Grammars - Building
-#       uses: actions-rs/cargo@v1
-#       with:
-#         command: build
-#         args: --package pest_bootstrap
-#     - name: Bootstraping Grammars - Executing
-#       uses: actions-rs/cargo@v1
-#       with:
-#         command: run
-#         args: --package pest_bootstrap
-#     - name: Fuzz Testing - Regressions
-#       env:
-#         FUZZIT_API_KEY: ${{ secrets.FuzzitApiKey }}
-#       run: ./fuzzit.sh local-regression
-#     - name: Fuzz Testing - Fuzzing
-#       env:
-#         FUZZIT_API_KEY: ${{ secrets.FuzzitApiKey }}
-#       run: ./fuzzit.sh fuzzing

README.md

@@ -11,7 +11,8 @@
 
 [![pest Continuous Integration](https://github.com/pest-parser/pest/actions/workflows/ci.yml/badge.svg)](https://github.com/pest-parser/pest/actions/workflows/ci.yml)
 [![codecov](https://codecov.io/gh/pest-parser/pest/branch/master/graph/badge.svg)](https://codecov.io/gh/pest-parser/pest)
-[![Fuzzit Status](https://app.fuzzit.dev/badge?org_id=pest-parser)](https://app.fuzzit.dev/orgs/pest-parser/dashboard)
+<a href="https://blog.rust-lang.org/2021/11/01/Rust-1.56.1.html"><img alt="Rustc Version 1.56.1+" src="https://img.shields.io/badge/rustc-1.56.1%2B-lightgrey.svg"/></a>
+
 [![Crates.io](https://img.shields.io/crates/d/pest.svg)](https://crates.io/crates/pest)
 [![Crates.io](https://img.shields.io/crates/v/pest.svg)](https://crates.io/crates/pest)
 
@@ -172,6 +173,11 @@ Digit:   2
 * [caith](https://github.com/Geobert/caith) (a dice roller crate)
 * [Melody](https://github.com/yoav-lavi/melody)
 
+## Minimum Supported Rust Version (MSRV)
+
+This library should always compile with default features on **Rust 1.56.1** 
+or **Rust 1.61** with `const_prec_climber`.
+
 ## Special thanks
 
 A special round of applause goes to prof. Marius Minea for his guidance and all