scrollbar: remove perfect-scrollbar and add baron to package list

package.json

@@ -152,7 +152,6 @@
     "moment": "^2.18.1",
     "mousetrap": "^1.6.0",
     "mousetrap-global-bind": "^1.1.0",
-    "perfect-scrollbar": "^1.2.0",
     "prop-types": "^15.6.0",
     "react": "^16.2.0",
     "react-dom": "^16.2.0",

yarn.lock

@@ -1162,6 +1162,10 @@ balanced-match@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
 
+baron@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/baron/-/baron-3.0.3.tgz#0f0a08a567062882e130a0ecfd41a46d52103f4a"
+
 base64-arraybuffer@0.1.5:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/base64-arraybuffer/-/base64-arraybuffer-0.1.5.tgz#73926771923b5a19747ad666aa5cd4bf9c6e9ce8"
@@ -7503,10 +7507,6 @@ pend@~1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/pend/-/pend-1.2.0.tgz#7a57eb550a6783f9115331fcf4663d5c8e007a50"
 
-perfect-scrollbar@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/perfect-scrollbar/-/perfect-scrollbar-1.2.0.tgz#ad23a2529c17f4535f21d1486f8bc3046e31a9d2"
-
 performance-now@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-0.2.0.tgz#33ef30c5c77d4ea21c5a53869d91b56d8f2555e5"