Updated string_decoder to v1.0.0

Author: mcollina

package.json

@@ -57,7 +57,7 @@
  "shell-quote": "^1.6.1",
  "stream-browserify": "^2.0.0",
  "stream-http": "^2.0.0",
- "string_decoder": "~0.10.0",
+ "string_decoder": "~1.0.0",
  "subarg": "^1.0.0",
  "syntax-error": "^1.1.1",
  "through2": "^2.0.0",