Update version_checker.rb

[justin808]

Per #782 feedback that it's too easy to have the npm and gem out of sync.

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This change is 

[coveralls]

Coverage remained the same at 97.922% when pulling e2c818c on justin808-change-logger-error-incorrect-npm-rubygems-combo into 5954e36 on master.

[coveralls]

Coverage remained the same at 97.922% when pulling dbe5dcf on justin808-change-logger-error-incorrect-npm-rubygems-combo into 5954e36 on master.

[coveralls]

Coverage remained the same at 97.922% when pulling dbe5dcf on justin808-change-logger-error-incorrect-npm-rubygems-combo into 5954e36 on master.