add osx-temperature-sensor as dependency (#415)

add osx-temperature-sensor as optional dependency (fix #402)

src/package.json

@@ -36,5 +36,8 @@
     "tail": "2.0.2",
     "ws": "6.1.3",
     "xterm": "3.10.1"
+  },
+  "optionalDependencies": {
+    "osx-temperature-sensor": "1.0.3"
   }
 }