v2.0.6

Fixed

• #3997 fix component style merging behavior (@defcc via #4138)
• #4098 fix IE in-dom template <textarea> placeholder being set as content
• #4143 fix component class merging behavior in SSR (@defcc via #4146)
• #4182 fix v-once inside v-for and v-once with v-if (@defcc via #4200)
• #4185 fix v-model path parsing regression (@defcc via #4188)
• #4191 fix data merging edge case
• #4204 fix v-model.trim modifier when used on components