upgrade ws to 7.1.2 (#70)

package-lock.json

@@ -199,6 +199,11 @@
             "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
             "dev": true
         },
+        "async-limiter": {
+            "version": "1.0.1",
+            "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
+            "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ=="
+        },
         "asynckit": {
             "version": "0.4.0",
             "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -1693,11 +1698,6 @@
                 "wordwrap": "~1.0.0"
             }
         },
-        "options": {
-            "version": "0.0.6",
-            "resolved": "https://registry.npmjs.org/options/-/options-0.0.6.tgz",
-            "integrity": "sha1-7CLTEoBrtT5zF3Pnza788cZDEo8="
-        },
         "ordered-read-streams": {
             "version": "1.0.1",
             "resolved": "https://registry.npmjs.org/ordered-read-streams/-/ordered-read-streams-1.0.1.tgz",
@@ -2313,11 +2313,6 @@
             "integrity": "sha512-jw7P2z/h6aPT4AENXDGjcfHTu5CSqzsbZc6YlUIebTyBAq8XaKp78x7VcSh30xwSCcsu5irZkYZUSFP1MrAMbg==",
             "dev": true
         },
-        "ultron": {
-            "version": "1.0.2",
-            "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.0.2.tgz",
-            "integrity": "sha1-rOEWq1V80Zc4ak6I9GhTeMiy5Po="
-        },
         "unc-path-regex": {
             "version": "0.1.2",
             "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
@@ -2654,12 +2649,11 @@
             }
         },
         "ws": {
-            "version": "1.1.5",
-            "resolved": "https://registry.npmjs.org/ws/-/ws-1.1.5.tgz",
-            "integrity": "sha512-o3KqipXNUdS7wpQzBHSe180lBGO60SoK0yVo3CYJgb2MkobuWuBX6dhkYP5ORCLd55y+SaflMOV5fqAB53ux4w==",
+            "version": "7.1.2",
+            "resolved": "https://registry.npmjs.org/ws/-/ws-7.1.2.tgz",
+            "integrity": "sha512-gftXq3XI81cJCgkUiAVixA0raD9IVmXqsylCrjRygw4+UOOGzPoxnQ6r/CnVL9i+mDncJo94tSkyrtuuQVBmrg==",
             "requires": {
-                "options": ">=0.0.5",
-                "ultron": "1.0.x"
+                "async-limiter": "^1.0.0"
             }
         },
         "xmldom": {