Replace apostrophe with empty string (like github)

parthpp · ep-parth · commit 1bb4a9ad9168 · 2019-06-21T10:44:04.000-04:00
Github treats apostrophe as empty string. Hence, slugger should do the same.
diff --git a/index.js b/index.js
@@ -4,7 +4,7 @@ module.exports = BananaSlug
 
 var own = Object.hasOwnProperty
 var whitespace = /\s/g
-var specials = /[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~]/g
+var specials = /[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~’]/g
 
 function BananaSlug () {
   var self = this
diff --git a/test/6-characters.md b/test/6-characters.md
@@ -13,3 +13,5 @@
 #  initial space
 
 # final space 
+
+# heading with apostrophe’s
diff --git a/test/index.js b/test/index.js
@@ -102,6 +102,12 @@ var testCases = [
     text: 'final space ',
     slug: 'final-space'
   },
+  // Note: Apostrophe in heading is trimmed off in markdown
+  {
+    mesg: 'apostrophe’s should be trimmed',
+    text: 'apostrophe’s should be trimmed',
+    slug: 'apostrophes-should-be-trimmed'
+  },
   // See `7-duplicates.md`
   {
     mesg: 'deals with duplicates correctly',
