fix(package): add missing dep

Author: fernandolguevara

package.json

@@ -9,6 +9,7 @@
   "license": "MIT",
   "repository": "expressjs/compression",
   "dependencies": {
+    "@stdlib/assert-is-uint8array": "^0.0.8",
     "accepts": "~1.3.7",
     "bytes": "3.0.0",
     "compressible": "~2.0.17",
@@ -28,7 +29,8 @@
     "eslint-plugin-standard": "4.0.1",
     "istanbul": "0.4.5",
     "mocha": "6.2.0",
-    "supertest": "4.0.2"
+    "supertest": "4.0.2",
+    "sinon": "^4.0.0"
   },
   "files": [
     "LICENSE",