chore(package): update fluent-ffmpeg to version 2.1.2 (#449)

Closes #433

https://greenkeeper.io/

package.json

@@ -138,7 +138,7 @@
     "eslint": "3.18.0",
     "eslint-plugin-ava": "4.2.0",
     "finis": "0.0.2",
-    "fluent-ffmpeg": "2.1.1",
+    "fluent-ffmpeg": "2.1.2",
     "jsdoc-to-markdown": "^3.0.0",
     "nyc": "10.2.0",
     "qrcode-terminal": "0.11.0",