Fix javadoc in clioption

[jmini]

See issue #63.

A new warning was introduced with #160:

openapi-generator/modules/openapi-generator/src/main/java/org/openapitools/codegen/CliOption.java

Lines 105 to 115 in bd50d36

	/**
	* Create new boolean command line option with the provided value as default
	*
	* @param opt Option name
	* @param description Option description
	* @param defaultValue the default value to use if option not specified
	* @return
	*/
	public static CliOption newBoolean(String opt, String description, boolean defaultValue) {
	return new CliOption(opt, description, SchemaTypeUtil.BOOLEAN_TYPE).defaultValue(String.valueOf(defaultValue));
	}

I have fixed it and I have now configured the build to fail when new warnings are created.