Rename MeiliSearch to Meilisearch in the deprecation warning message

Author: brunoocasali

lib/meilisearch/utils.rb

@@ -58,7 +58,7 @@ def self.warn_on_non_conforming_attribute_names(body)
       return if non_snake_case.empty?
 
       message = <<~MSG
-        Attributes will be expected to be snake_case in future versions of MeiliSearch.
+        Attributes will be expected to be snake_case in future versions of Meilisearch Ruby.
 
         Non-conforming attributes: #{non_snake_case.join(', ')}
       MSG