Updraded mongo ruby driver

Gemfile

@@ -19,7 +19,7 @@ gem 'yajl-ruby', '~> 1.3.1'
 gem 'activemodel', '~> 4.2.8'
 
 gem 'mongoid', '~> 5.0.0'
-gem 'bson', '~> 3.1'
+gem 'bson'
 gem 'bson_ext'
 gem 'protected_attributes'
 

Gemfile.lock

@@ -33,7 +33,7 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.5.1)
       public_suffix (~> 2.0, >= 2.0.2)
-    bson (3.2.6)
+    bson (4.7.0)
     bson_ext (1.5.1)
     builder (3.2.3)
     codecov (0.1.10)
@@ -105,8 +105,8 @@ GEM
     mime-types-data (3.2016.0521)
     mini_portile2 (2.3.0)
     minitest (5.10.2)
-    mongo (2.1.2)
-      bson (~> 3.0)
+    mongo (2.11.2)
+      bson (>= 4.6.0, < 5.0.0)
     mongoid (5.0.0)
       activemodel (~> 4.0)
       mongo (~> 2.1)
@@ -216,7 +216,7 @@ PLATFORMS
 
 DEPENDENCIES
   activemodel (~> 4.2.8)
-  bson (~> 3.1)
+  bson
   bson_ext
   bundler
   codecov
@@ -257,8 +257,5 @@ DEPENDENCIES
   will_paginate_mongoid (~> 2.0)
   yajl-ruby (~> 1.3.1)
 
-RUBY VERSION
-   ruby 2.4.1p111
-
 BUNDLED WITH
-   1.16.1
+   1.17.3