chore: pin simple-peer to 9.7.1

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "run-parallel": "^1.1.9",
     "run-series": "^1.1.8",
     "simple-get": "^3.1.0",
-    "simple-peer": "^9.7.1",
+    "simple-peer": "9.7.1",
     "simple-websocket": "^8.1.1",
     "string2compact": "^1.3.0",
     "unordered-array-remove": "^1.0.2",