[CLA] eternalharvest signs Odoo CLA

Done at #24066

doc/cla/individual/eternalharvest.md

+Japan, 2018-04-05
+
+I hereby agree to the terms of the Odoo Individual Contributor License
+Agreement v1.0.
+
+I declare that I am authorized and able to make this agreement and sign this
+declaration.
+
+Signed,
+
+Takuya Sawada <takuya@tuntunkun.com> https://github.com/eternalharvest