Update bundler

Author: jberkel

Gemfile.lock

@@ -67,7 +67,7 @@ GEM
     colored2 (3.1.2)
     concurrent-ruby (1.3.5)
     connection_pool (2.5.3)
-    drb (2.2.1)
+    drb (2.2.3)
     escape (0.0.4)
     ethon (0.16.0)
       ffi (>= 1.15.0)
@@ -113,4 +113,4 @@ DEPENDENCIES
   cocoapods
 
 BUNDLED WITH
-   2.5.4
+   2.6.9