Release 15.9.64

• Upgrade eslint-config-prettier 4.3.0 -> 5.0.0 (589157c)
• Upgrade core-js 3.1.3 -> 3.1.4 (0f879d6)
• Upgrade gulp-shared-tasks 0.29.18 -> 0.29.19 (d7d834c)
• Upgrade husky 2.4.0 -> 2.4.1 (5693678)
• Upgrade gulp-shared-tasks 0.29.17 -> 0.29.18 (7240f5b)