New lint: mem_replace_option_with_some

`mem::replace(opt, Some(v))` can be replaced by `opt.replace(v)`.

clippy_utils/src/msrvs.rs

@@ -58,6 +58,7 @@ msrv_aliases! {
     1,35,0 { OPTION_COPIED, RANGE_CONTAINS }
     1,34,0 { TRY_FROM }
     1,33,0 { UNDERSCORE_IMPORTS }
+    1,31,0 { OPTION_REPLACE }
     1,30,0 { ITERATOR_FIND_MAP, TOOL_ATTRIBUTES }
     1,29,0 { ITER_FLATTEN }
     1,28,0 { FROM_BOOL, REPEAT_WITH }