no-fn-reference-in-iterator: Ignore this. and Vue.filter()

[fisker]

Fixes #698
Fixes #694

[fisker]

@sindresorhus

Can you merge and do a patch release?

• Ignore this.{map,…}() call
• Ignore Vue.filter() call
• Ignore cases obviously not a function reference no-fn-reference-in-iterator: Ignore cases obviously not a function reference #697

[GuoSirius]

@sindresorhus

Can you merge and do a patch release?

• Ignore this.{map,…}() call
• Ignore Vue.filter() call
• Ignore cases obviously not a function reference no-fn-reference-in-iterator: Ignore cases obviously not a function reference #697

  watch: {
    keywords(val) {
      this.$refs.tree.filter(val)
    }
  }

The above situation can also be ignored, ElementUI's Tree component comes with its own filter method