Merge pull request reidmorrison#183 from petergoldstein/bugfix/fix_use_of_2_7_syntax

Don't use 2.7+ syntax, which breaks compatibility with earlier Ruby versions

Author: reidmorrison

lib/rails_semantic_logger/engine.rb

@@ -111,7 +111,7 @@ class Engine < ::Rails::Engine
       if defined?(Sidekiq)
         if Sidekiq.respond_to?(:logger=)
           Sidekiq.logger = SemanticLogger[Sidekiq]
-        elsif Sidekiq::VERSION[..1] == '7.'
+        elsif Sidekiq::VERSION[0..1] == '7.'
           method = Sidekiq.server? ? :configure_server : :configure_client
           Sidekiq.public_send(method) { |cfg| cfg.logger = SemanticLogger[Sidekiq] }
         end