Add instagram icon

CHANGELOG.md

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   - `filter`
   - `hash`
   - `home`
+  - `instagram`
   - `map-pin`
   - `mic-off`
   - `phone`

icons-manifest.json

@@ -32,6 +32,7 @@
   "thumbs-up",
   "thumbs-down",
   "facebook",
+  "instagram",
   "at-sign",
   "hash",
   "phone",

icons/instagram.svg

+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <rect x="2" y="2" width="20" height="20" rx="5" ry="5"/>
+  <path d="M16,11.37A4,4,0,1,1,12.63,8,4,4,0,0,1,16,11.37Z"/>
+  <line x1="17.5" y1="6.5" x2="17.5" y2="6.5"/>
+</svg>
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