[Fix #500] Mark Performance/MapCompact cop as unsafe

Author: GitHub Refactor Bot

changelog/fix_mark_performance_map_compact_cop_as.md

@@ -0,0 +1 @@
+* [#500](https://github.com/rubocop/rubocop-performance/issues/500): Mark `Performance/MapCompact` cop as unsafe. ([@jbpextra][])

config/default.yml

@@ -194,7 +194,7 @@ Performance/IoReadlines:
 Performance/MapCompact:
   Description: 'Use `filter_map` instead of `collection.map(&:do_something).compact`.'
   Enabled: pending
-  SafeAutoCorrect: false
+  Safe: false
   VersionAdded: '1.11'
 
 Performance/MapMethodChain:

docs/modules/ROOT/pages/cops_performance.adoc

@@ -1250,7 +1250,7 @@ NOTE: Requires Ruby version 2.7
 | Enabled by default | Safe | Supports autocorrection | Version Added | Version Changed
 
 | Pending
-| Yes
+| No
 | Always (Unsafe)
 | 1.11
 | -
@@ -1269,7 +1269,7 @@ This cop identifies places where `map { ... }.compact` can be replaced by `filte
 [#safety-performancemapcompact]
 === Safety
 
-This cop's autocorrection is unsafe because `map { ... }.compact` might yield
+This cop is unsafe because `map { ... }.compact` might yield
 different results than `filter_map`. As illustrated in the example, `filter_map`
 also filters out falsy values, while `compact` only gets rid of `nil`.