Merge pull request #11 from LilithHafner/patch-1

`!===` => `!==` in compare-nothing.yaml hint

rules/lang/correctness/compare-nothing.yaml

@@ -6,7 +6,7 @@ rules:
           - pattern: ... == nothing
           - pattern: nothing != ...
           - pattern: ... != nothing 
-    message: comparisons of `nothing` should be made with === or !=== or with isnothing()
+    message: comparisons of `nothing` should be made with === or !== or with isnothing()
     languages: [julia]
     severity: ERROR
     metadata: