Release 15.9.35

• Fix eslint-plugin-html bug (bba6399)
• Upgrade gulp-shared-tasks 0.27.59 -> 0.27.60 (d38728f)
• Upgrade gulp-shared-tasks 0.27.58 -> 0.27.59 (8798df3)
• Upgrade gulp-shared-tasks 0.27.57 -> 0.27.58 (ad48a34)
• Test on Travis using Node 12 (ff30c40)
• Upgrade gulp-shared-tasks 0.27.56 -> 0.27.57 (e8c3949)
• Upgrade gulp 4.0.1 -> 4.0.2 (dc8954d)
• Upgrade gulp-shared-tasks 0.27.55 -> 0.27.56 (a0afbb8)
• Upgrade gulp-shared-tasks 0.27.54 -> 0.27.55 (80c1604)
• Upgrade gulp-shared-tasks 0.27.53 -> 0.27.54 (bd786ab)
• Upgrade gulp-shared-tasks 0.27.52 -> 0.27.53 (389acd2)