Handle uppercase case insensitivity attribute flag.

Author: chriseppstein

src/__tests__/attributes.js

@@ -334,6 +334,10 @@ test('insensitive attribute selector 3', '[href=test i]', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[0].value, 'test');
     t.deepEqual(tree.nodes[0].nodes[0].insensitive, true);
 });
+test('capitalized insensitive attribute selector 3', '[href=test I]', (t, tree) => {
+    t.deepEqual(tree.nodes[0].nodes[0].value, 'test');
+    t.deepEqual(tree.nodes[0].nodes[0].insensitive, true);
+});
 
 test('extraneous non-combinating whitespace', '  [href]   ,  [class]   ', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[0].attribute, 'href');

src/parser.js

@@ -275,10 +275,11 @@ export default class Parser {
                     }
                     lastAdded = 'value';
                 } else {
-                    let insensitive = (content === 'i');
+                    let insensitive = (content === 'i' || content === "I");
                     if (node.value && (node.quoteMark || spaceAfterMeaningfulToken)) {
-                        node.insensitive = true;
-                        if (!insensitive) {
+                        node.insensitive = insensitive;
+                        if (!insensitive || content === "I") {
+                            ensureObject(node, 'raws');
                             node.raws.insensitiveFlag = content;
                         }
                         lastAdded = 'insensitive';