Make label comparison case insensitive (#517)

* Make label comparison case insensitive

* PR Feedback

src/functions/clean-label.ts

@@ -0,0 +1,14 @@
+import deburr from 'lodash.deburr';
+import { CleanLabel } from '../types/clean-label';
+
+/**
+ * @description
+ * Clean a label by lowercasing it and deburring it for consistency
+ *
+ * @param {string} label A raw GitHub label
+ *
+ * @return {string} A lowercased, deburred version of the passed in label
+ */
+export function cleanLabel(label: Readonly<string>): CleanLabel {
+    return deburr(label.toLowerCase());
+}