Add Ruby 2.6/2.7 to CI martrix and drop Ruby 2.3 support
Add Ruby 2.6/2.7 to CI martrix with dropping Ruby 2.3 support to update !11 (merged).
Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com
Edited by Takuya Noguchi
Add Ruby 2.6/2.7 to CI martrix with dropping Ruby 2.3 support to update !11 (merged).
Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com