Add alert-octagon icon

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 - Add # new icons:
   - `alert-circle`
+  - `alert-octagon`
   - `alert-triangle`
   - `aperture`
   - `at-sign`

icons-manifest.json

@@ -47,6 +47,7 @@
   "info",
   "alert-circle",
   "alert-triangle",
+  "alert-octagon",
   "bell",
   "bell-off",
   "music",

icons/alert-octagon.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">
+  <polygon points="7.86 2 16.14 2 22 7.86 22 16.14 16.14 22 7.86 22 2 16.14 2 7.86 7.86 2"/>
+  <line x1="12" y1="8" x2="12" y2="12"/>
+  <line x1="12" y1="16" x2="12" y2="16"/>
+</svg>
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