all: update gogrep links, we're using a different gogrep now (#320)

README.md

@@ -184,6 +184,6 @@ Note: `go-critic` embeds the rules using the IR precompilation feature.
 ## Extra references
 
 * Online ruleguard playground: [go-ruleguard.github.io/play](https://go-ruleguard.github.io/play)
-* [gogrep](https://github.com/mvdan/gogrep) - underlying AST matching engine
+* [gogrep](https://github.com/quasilyte/gogrep) - underlying AST matching engine
 * [NoVerify: Dynamic Rules for Static Analysis](https://medium.com/@vktech/noverify-dynamic-rules-for-static-analysis-8f42859e9253)
 * [Ruleguard comparison with Semgrep and CodeQL](https://speakerdeck.com/quasilyte/ruleguard-vs-semgrep-vs-codeql)

_docs/dsl.md

@@ -30,7 +30,7 @@ Every **matcher function** accepts exactly 1 argument, a [`dsl.Matcher`](https:/
 
 Every **rule** definition starts with a [`Match()`](https://godoc.org/github.com/quasilyte/go-ruleguard/dsl#Matcher.Match) or [`MatchComment()`](https://godoc.org/github.com/quasilyte/go-ruleguard/dsl#Matcher.MatchComment) method call.
 
-* For `Match()`, you specify one or more [AST patterns](https://github.com/mvdan/gogrep) that should represent what kind of Go code a rule is supposed to match.
+* For `Match()`, you specify one or more [AST patterns](https://github.com/quasilyte/gogrep) that should represent what kind of Go code a rule is supposed to match.
 * For `MatchComment()`, you provide one or more regular expressions that should match a comment of interest.
 
 Another mandatory part is [`Report()`](https://godoc.org/github.com/quasilyte/go-ruleguard/dsl#Matcher.Report) or [`Suggest()`](https://godoc.org/github.com/quasilyte/go-ruleguard/dsl#Matcher.Suggest) that describe a rule match action. `Report()` will print a warning message while `Suggest()` can be used to provide a quickfix action (a syntax rewrite pattern).