Fix readme checkboxes

README.md

@@ -7,74 +7,74 @@ An implementation of the SASS spec in rust with 0 dependencies
 `grass` is far from being feature complete! Below you can see what SCSS features are currently supported.
 My MVP will include `values`, `@mixin`, `@include`, `@media`, `styles`, `operators`, `css functions` and `css at rules`.
 
-[] Variables
-    [x] Scoping
-    [x] Shadowing
-    [] Built-in variables
-    [] !default
-    [] !global
-[x] @import
-[x] @error
-[x] @warn
-[x] @debug
-[] Styles
-    [x] !important
-    [x] Interpolation
-    [] Nesting
-    [] Custom properties
-    [] Hidden declarations
-[] Selectors
-    [x] Attributes
-    [x] Parent selector &
-    [x] All other selectors
-    [x] Nesting
-    [] Placeholder selector %
-[x] Comments
-    [x] Removes single line comments
-    [x] Preserves toplevel multiline comments
-    [x] Removes inline multiline comments
-[] @mixin
-    [x] Keyword args
-    [x] Default arg values
-    [] Variadic args
-    [] @content
-[] @include
-    [x] Keyword args
-    [x] Default arg values
-    [] Content blocks
-[] Functions
-    [] @return
-[] Control flow
-    [] @if
-    [] @else
-    [] @for
-    [] @while
-    [] @each
-[] Constant folding
-[] Unit arithmetic
-[] CSS at rules
-[] CSS functions
-    [] calc()
-    [] url()
-    [] element()
-    [] progid:...()
-    [] expression()
-    [] min()
-    [] max()
-[] @media
-[] @use
-[] @extend
-[] @at-root
-[] @forward
-[] Values
-    [] Numbers
-    [] Strings
-    [] Colors
-    [] Lists
-    [] Maps
-    [] Booleans
-    [] Null
-[] Operators
-[] Built-in modules
-[] Content encoding
-[] WASM bindings
+- [ ] Variables
+  - [x] Scoping
+  - [x] Shadowing
+  - [ ] Built-in variables
+  - [ ] !default
+  - [ ] !global
+- [x] @import
+- [x] @error
+- [x] @warn
+- [x] @debug
+- [ ] Styles
+  - [x] !important
+  - [x] Interpolation
+  - [ ] Nesting
+  - [ ] Custom properties
+  - [ ] Hidden declarations
+- [ ] Selectors
+  - [x] Attributes
+  - [x] Parent selector &
+  - [x] All other selectors
+  - [x] Nesting
+  - [ ] Placeholder selector %
+- [x] Comments
+  - [x] Removes single line comments
+  - [x] Preserves toplevel multiline comments
+  - [x] Removes inline multiline comments
+- [ ] @mixin
+  - [x] Keyword args
+  - [x] Default arg values
+  - [ ] Variadic args
+  - [ ] @content
+- [ ] @include
+  - [x] Keyword args
+  - [x] Default arg values
+  - [ ] Content blocks
+- [ ] Functions
+  - [ ] @return
+- [ ] Control flow
+  - [ ] @if
+  - [ ] @else
+  - [ ] @for
+  - [ ] @while
+  - [ ] @each
+- [ ] Constant folding
+- [ ] Unit arithmetic
+- [ ] CSS at rules
+- [ ] CSS functions
+  - [ ] calc()
+  - [ ] url()
+  - [ ] element()
+  - [ ] progid:...()
+  - [ ] expression()
+  - [ ] min()
+  - [ ] max()
+- [ ] @media
+- [ ] @use
+- [ ] @extend
+- [ ] @at-root
+- [ ] @forward
+- [ ] Values
+  - [ ] Numbers
+  - [ ] Strings
+  - [ ] Colors
+  - [ ] Lists
+  - [ ] Maps
+  - [ ] Booleans
+  - [ ] Null
+- [ ] Operators
+- [ ] Built-in modules
+- [ ] Content encoding
+- [ ] WASM bindings