chore(deps): update lib-jitsi-meet for ie11 stringify failure

package-lock.json

       }
     },
     "lib-jitsi-meet": {
-      "version": "github:jitsi/lib-jitsi-meet#f71ff66fb26f9dd0b49baeeee239345ba268d46d",
+      "version": "github:jitsi/lib-jitsi-meet#c7d6d158b9ab87f47b2bb8484565bcb17e687f7e",
       "requires": {
         "async": "0.9.0",
         "current-executing-script": "0.1.3",
       "integrity": "sha1-8z/pz7Urv9UgqhgyO8ZdsRCht2w="
     },
     "rtcpeerconnection-shim": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/rtcpeerconnection-shim/-/rtcpeerconnection-shim-1.2.3.tgz",
-      "integrity": "sha512-+0lqV/f8R4C7VA/F/UdE66DtoGHHgL1m2movvj2XRAscUOObNW9X5A5FmP+NkXH6AM/ucM3TNrfxxqdkaBbZGg==",
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/rtcpeerconnection-shim/-/rtcpeerconnection-shim-1.2.4.tgz",
+      "integrity": "sha512-DQ65pr+e9GYC52dVj9Pqoh2cOC3gl4956XXbPWgGvPOqX3sA3nmv3qvf9OMyYq5MwHAQeLnYkGnJaBIRiBBIQw==",
       "requires": {
         "sdp": "2.5.0"
       }
     "webrtc-adapter": {
       "version": "github:webrtc/adapter#1eec19782b4058d186341263e7d049cea3e3290a",
       "requires": {
-        "rtcpeerconnection-shim": "1.2.3",
+        "rtcpeerconnection-shim": "1.2.4",
         "sdp": "2.5.0"
       }
     },

package.json

     "jquery-i18next": "1.2.0",
     "js-md5": "0.6.1",
     "jwt-decode": "2.2.0",
-    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#f71ff66fb26f9dd0b49baeeee239345ba268d46d",
+    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#c7d6d158b9ab87f47b2bb8484565bcb17e687f7e",
     "lodash": "4.17.4",
     "moment": "2.19.4",
     "nuclear-js": "1.4.0",