Add language info to fenced code blocks. Testing it in GFM.

README.md

@@ -41,7 +41,7 @@ Or install it yourself as:
 
 Add an initializer at config/knockoff.rb with the below contents
 
-```
+```ruby
 Knockoff.enabled = true # NOTE: Consider adding ENV based disabling
 ```
 
@@ -71,7 +71,7 @@ KNOCKOFF_REPLICA_ENVS=REPLICA_1,REPLICA_2
 
 Lastly, knockoff will read the `'knockoff_replicas'` database.yml config for specifying additional params:
 
-```
+```yml
 # database.yml
 
 knockoff_replicas:
@@ -83,21 +83,21 @@ knockoff_replicas:
 
 To use one of the replica databases, use
 
-```
+```ruby
 Knockoff.on_replica { User.count }
 ```
 
 To force primary, use
 
-```
+```ruby
 Knockoff.on_primary { User.create(name: 'Bob') }
 ```
 
 ### Using in Controllers
 
 A common use case is to use replicas for GET requests and otherwise use primary. A simplified use case might look something like this:
 
-```
+```ruby
 # application_controller.rb
 
 around_action :choose_database
@@ -120,7 +120,7 @@ end
 
 Replicas will often be slightly behind the primary database. To compensate, consider "sticking" a user who has recently made changes to the primary for a small duration of time to the primary database. This will avoid cases where a user creates a record on primary, is redirected to view that record, and receives a 404 error since the record is not yet in the replica. A simple implementation for this could look like:
 
-```
+```ruby
 # application_record.rb
 
 after_commit :track_commit_occurred_in_request
@@ -149,13 +149,13 @@ Then, in your `should_use_primary_database?` method, consult `session[:use_leade
 
 Knockoff can be configured during runtime. This is done through the `establish_new_connections!` method which takes in a hash of new configurations to apply to each replica before re-connecting.
 
-```
+```ruby
 Knockoff.establish_new_connections!({ 'pool' => db_pool })
 ```
 
 For example, to specify a puma connection pool at bootup your code might look something like
 
-```
+```ruby
 # puma.rb
 
 db_pool = Integer(ENV['PUMA_WORKER_DB_POOL'] || threads_count)
@@ -171,7 +171,7 @@ Knockoff.establish_new_connections!({ 'pool' => db_pool })
 
 For forking servers, you may disconnect all replicas before forking with `Knockoff.disconnect_all!`.
 
-```
+```ruby
 # puma.rb
 
 before_fork do