Add Instagram filter

src/filters/index.js

@@ -1,5 +1,7 @@
 import twitter from './twitter';
+import instagram from './instagram';
 
 export default {
-  twitter
+  twitter,
+  instagram
 };

src/filters/instagram.js

@@ -0,0 +1,8 @@
+export default {
+  hashtags: {
+    filter: tag => `<a target="_blank" href="https://www.instagram.com/explore/tags/${tag.replace('#', '')}/">${tag}</a>`
+  },
+  mentions: {
+    filter: user => `<a target="_blank" href="https://www.instagram.com/${user.replace('@', '')}/">${user}</a>`
+  }
+};