Remove connection_pool version clamp

Hopefully whatever the problem was is fixed now, see
mperham/connection_pool#210 which
makes me think it should be.

Author: simonbaird

rails/Gemfile

@@ -41,10 +41,7 @@ gem 'redcarpet', '~> 3.6'
 # For memcached
 gem 'dalli'
 
-# Pin connection_pool to avoid breaking changes in 3.x related to
-# dalli and MemCacheStore
-# See: https://github.com/mperham/connection_pool/issues/210
-gem 'connection_pool', '< 3.0'
+gem 'connection_pool'
 
 # Added manually to fix error running tests...?
 gem 'rexml'

rails/Gemfile.lock

@@ -127,7 +127,7 @@ GEM
       xpath (~> 3.2)
     charlock_holmes (0.7.9)
     concurrent-ruby (1.3.6)
-    connection_pool (2.5.5)
+    connection_pool (3.0.2)
     crass (1.0.6)
     css_parser (2.2.0)
       addressable
@@ -408,7 +408,7 @@ DEPENDENCIES
   byebug
   capybara (>= 3.26)
   charlock_holmes
-  connection_pool (< 3.0)
+  connection_pool
   csv
   daemons
   dalli