chore(dep) Upgrade to lerna 3.20 for vulnerability fixes

Signed-off-by: Jerome Simeon <[email protected]>

Author: jeromesimeon

.travis.yml

@@ -14,7 +14,7 @@ before_install: |
 install: |
   set -e
   date
-  npm install -g lerna@^3.15.0
+  npm install -g lerna@^3.20.2
   npm install 2>&1
   date
 script: npm run test 2>&1

lerna.json

@@ -1,5 +1,5 @@
 {
-  "lerna": "3.15.0",
+  "lerna": "3.20.2",
   "packages": [
     "packages/*"
   ],