The project already depends on Guava 26.0-jre, which reuqires Java 8. Without this change, the project doesn't even compile in IntelliJ.
The project already depends on Guava 26.0-jre, which reuqires Java 8. Without this change, the project doesn't even compile in IntelliJ.

Signed-off-by: Yuichi Sasaki <669e5752e486c7cc8da03320ef04c8566874200b@astro-inc.com>

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