stabilise remove_nested_parens and set default to true

Configurations.md

@@ -1260,7 +1260,7 @@ Convert /* */ comments to // comments where possible
 
 - **Default value**: `false`
 - **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Stable**: No
 
 #### `false` (default):
 
@@ -1286,24 +1286,25 @@ fn adipiscing() -> usize {}
 
 Remove nested parens.
 
-- **Defalut value**: `false`,
+- **Default value**: `true`,
 - **Possible values**: `true`, `false`
-- **Stable**: No
+- **Stable**: Yes
 
-#### `false` (default):
-```rust
-fn main() {
-    ((((foo()))));
-}
-```
 
-#### `true`:
+#### `true` (default):
 ```rust
 fn main() {
     (foo());
 }
 ```
 
+#### `false`:
+```rust
+fn main() {
+    ((((foo()))));
+}
+```
+
 
 ## `reorder_imports`
 
@@ -1312,7 +1313,7 @@ separated by a newline).
 
 - **Default value**: `true`
 - **Possible values**: `true`, `false`
-- **Stable**: No
+- **Stable**: Yes
 
 #### `true` (default):
 
@@ -1339,7 +1340,7 @@ Reorder `mod` declarations alphabetically in group.
 
 - **Default value**: `true`
 - **Possible values**: `true`, `false`
-- **Stable**: No
+- **Stable**: Yes
 
 #### `true` (default)
 
@@ -1764,7 +1765,7 @@ Use field initialize shorthand if possible.
 
 - **Default value**: `false`
 - **Possible values**: `true`, `false`
-- **Stable**: No
+- **Stable**: Yes
 
 #### `false` (default):
 
@@ -1806,7 +1807,7 @@ Replace uses of the try! macro by the ? shorthand
 
 - **Default value**: `false`
 - **Possible values**: `true`, `false`
-- **Stable**: No
+- **Stable**: Yes
 
 #### `false` (default):
 
@@ -1831,7 +1832,7 @@ Break comments to fit on the line
 
 - **Default value**: `false`
 - **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Stable**: No
 
 #### `false` (default):
 

src/config/mod.rs

@@ -82,6 +82,7 @@ create_config! {
         "Where to put a binary operator when a binary expression goes multiline.";
 
     // Misc.
+    remove_nested_parens: bool, true, true, "Remove nested parens.";
     remove_blank_lines_at_start_or_end_of_block: bool, true, false,
         "Remove blank lines at start or end of a block";
     combine_control_expr: bool, true, false, "Combine control expressions with function calls.";
@@ -105,8 +106,6 @@ create_config! {
         "Maximum number of blank lines which can be put between items.";
     blank_lines_lower_bound: usize, 0, false,
         "Minimum number of blank lines which must be put between items.";
-    remove_nested_parens: bool, false, false,
-        "Remove nested parens.";
 
     // Options that can change the source code beyond whitespace/blocks (somewhat linty things)
     merge_derives: bool, true, true, "Merge multiple `#[derive(...)]` into a single one";