Release 0.31.13

• Update to new Prettier (0df6bd2)
• Upgrade @ehmicky/eslint-config 15.10.46 -> 15.10.47 (c00aed1)
• Upgrade gulp-prettier 2.3.0 -> 3.0.0 (7c8bf81)
• Upgrade prettier 1.19.1 -> 2.0.1 (8e165de)
• Update lock file (5dadfe6)