embulk gem install

embulk.txt

### 0.9.18

embulk --version
embulk 0.9.18

embulk gem install -l embulk-output-bigquery-0.6.0.gem
Exception in thread "main" java.lang.IllegalArgumentException: Log level embulk-output-bigquery-0.6.0.gem is invalid. Available levels are error, warn, info, debug and trace.
	at org.embulk.cli.CliLogbackConfigurator.chooseLevel(CliLogbackConfigurator.java:150)
	at org.embulk.cli.CliLogbackConfigurator.configureLogger(CliLogbackConfigurator.java:115)
	at org.embulk.cli.CliLogbackConfigurator.configure(CliLogbackConfigurator.java:24)
	at org.embulk.cli.Main.main(Main.java:59)
	

### 0.8.39
	
% gem install -l embulk-output-bigquery-0.6.0.gem
2019-08-27 22:02:17.523 +0900: Embulk v0.8.39

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Gem plugin path is: /Users/user/.embulk/jruby/2.3.0

Successfully installed embulk-output-bigquery-0.6.0
1 gem installed