Revert "temporarily point at new_adapter_api branch for database_cleaner-core so that travis is green for the PR."

This reverts commit f539c72.

Author: botandrose-machine

Gemfile

@@ -3,7 +3,7 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in database_cleaner-redis.gemspec
 gemspec
 
-gem "database_cleaner-core", git: "https://github.com/DatabaseCleaner/database_cleaner", branch: "new_adapter_api"
+gem "database_cleaner-core", git: "https://github.com/DatabaseCleaner/database_cleaner"
 
 group :test do
   gem "simplecov", require: false