Add clippy version to Clippy's lint list

clippy_dev/src/update_lints.rs

@@ -18,6 +18,7 @@ static DEC_CLIPPY_LINT_RE: SyncLazy<Regex> = SyncLazy::new(|| {
         r#"(?x)
     declare_clippy_lint!\s*[\{(]
     (?:\s+///.*)*
+    (?:\s*\#\[clippy::version\s*=\s*"[^"]*"\])?
     \s+pub\s+(?P<name>[A-Z_][A-Z_0-9]*)\s*,\s*
     (?P<cat>[a-z_]+)\s*,\s*
     "(?P<desc>(?:[^"\\]+|\\(?s).(?-s))*)"\s*[})]

clippy_lints/src/utils/internal_lints/metadata_collector.rs

@@ -146,7 +146,7 @@ declare_clippy_lint! {
     ///     "docs": " ### What it does\nCollects metadata about clippy lints for the website. [...] "
     /// }
     /// ```
-    #[clippy::version = "0.1.56"]
+    #[clippy::version = "1.56.0"]
     pub INTERNAL_METADATA_COLLECTOR,
     internal_warn,
     "A busy bee collection metadata about lints"

util/gh-pages/index.html

@@ -339,7 +339,10 @@ Otherwise, have a great day =^.^=
                             <span class="label label-default label-applicability">{{lint.applicability.applicability}}</span>
                             <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint_defs/enum.Applicability.html#variants">(?)</a>
                         </div>
-                        <!-- TODO xFrednet 2021-05-19: Somehow collect and show the version See rust-clippy#6492 -->
+                        <!-- Clippy version -->
+                        <div class="lint-additional-info-item">
+                            Rust version: <span class="label label-default label-applicability">{{lint.version}}</span>
+                        </div>
                         <!-- Open related issues -->
                         <div class="lint-additional-info-item">
                             <a href="https://github.com/rust-lang/rust-clippy/issues?q=is%3Aissue+{{lint.id}}">Related Issues</a>