chore: disable some coverage that I don't think makes sense

lib/unleash/metrics_reporter.rb

@@ -39,7 +39,9 @@ def post
       if ['200', '202'].include? response.code
         Unleash.logger.debug "Report sent to unleash server successfully. Server responded with http code #{response.code}"
       else
+        # :nocov:
         Unleash.logger.error "Error when sending report to unleash server. Server responded with http code #{response.code}."
+        # :nocov:
       end
     end
   end

lib/unleash/toggle_fetcher.rb

@@ -91,11 +91,17 @@ def read!
       backup_data = File.read(backup_file)
       update_engine_state!(backup_data)
     rescue IOError => e
+      # :nocov:
       Unleash.logger.error "Unable to read the backup_file: #{e}"
+      # :nocov:
     rescue JSON::ParserError => e
+      # :nocov:
       Unleash.logger.error "Unable to parse JSON from existing backup_file: #{e}"
+      # :nocov:
     rescue StandardError => e
+      # :nocov:
       Unleash.logger.error "Unable to extract valid data from backup_file. Exception thrown: #{e}"
+      # :nocov:
     end
 
     def bootstrap

lib/unleash/variant.rb

@@ -12,7 +12,9 @@ def initialize(params = {})
     end
 
     def to_s
+      # :nocov:
       "<Variant: name=#{self.name},enabled=#{self.enabled},payload=#{self.payload}>"
+      # :nocov:
     end
 
     def ==(other)