change casing of expected in modifier error

src/selector/attribute.rs

@@ -42,7 +42,7 @@ impl Attribute {
         devour_whitespace(toks);
 
         let kind = match toks.next().ok_or("expected \"{\".")?.kind {
-            c if is_ident_char(c) => return Err("expected \"]\".".into()),
+            c if is_ident_char(c) => return Err("Expected \"]\".".into()),
             ']' => {
                 return Ok(SelectorKind::Attribute(Attribute {
                     kind: AttributeKind::Any,

tests/selectors.rs

@@ -321,5 +321,5 @@ test!(escaped_space, "a\\ b {\n  color: foo;\n}\n");
 error!(
     modifier_on_any_attr,
     "[attr i] {color: foo;}",
-    "Error: expected \"]\"."
+    "Error: Expected \"]\"."
 );