Relax log level (#11)

Related to #6

Signed-off-by: Shizuo Fujita <[email protected]>

Author: Watson1978

lib/fluent/plugin/fluent_package_update_checker.rb

@@ -21,7 +21,7 @@ def initialize(options={})
           begin
             require ENV["FLUENT_PACKAGE_CONFIG"] || DEFAULT_PACKAGE_CONFIG_PATH
           rescue LoadError
-            @logger.error "Failed to load #{ENV["FLUENT_PACKAGE_CONFIG"] || DEFAULT_PACKAGE_CONFIG_PATH}"
+            @logger.info "Failed to load #{ENV["FLUENT_PACKAGE_CONFIG"] || DEFAULT_PACKAGE_CONFIG_PATH}"
           end
           @host_os = RbConfig::CONFIG['host_os']
           Specinfra.configuration.backend = windows? ? :cmd : :exec