chore: downgrades lerne to 3.16.5. (#481)

Author: jcchavezs

lerna.json

@@ -1,5 +1,5 @@
 {
-  "lerna": "3.15.0",
+  "lerna": "3.16.5",
   "version": "0.19.1",
   "command": {
     "run": {

package.json

@@ -56,7 +56,7 @@
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.0.0",
     "karma-source-map-support": "^1.3.0",
-    "lerna": "^3.20.2",
+    "lerna": "^3.16.5",
     "lolex": "^1.5.1",
     "mocha": "^5.2.0",
     "npm-run-all": "^4.1.3",