Debug flaky test with double done()

Author: ericyhwang

package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "async": "^2.6.3",
     "mongodb": "^2.1.2 || ^3.1.13 || ^4.0.0",
-    "sharedb": "^1.9.1 || ^2.0.0 || ^3.0.0"
+    "sharedb": "share/sharedb#debug-test-mongo-double-done"
   },
   "devDependencies": {
     "chai": "^4.2.0",
@@ -19,7 +19,7 @@
     "mongodb4": "npm:mongodb@^4.0.0",
     "nyc": "^14.1.1",
     "ot-json1": "^1.0.1",
-    "sharedb-mingo-memory": "^1.1.1",
+    "sharedb-mingo-memory": "^2.0.0",
     "sinon": "^6.1.5",
     "sinon-chai": "^3.7.0"
   },