Fix: html-indent about binary expressions (fixes #264)

[mysticatea]

Fixes #264.

This PR fixes vue/html-indent rule about the indentation of binary expressions.

Before, the second line of binary expressions always has 1 indent from the first line.
After this PR, the second line of binary expressions has the same indentation as the first line in except the following cases:

• The first token of the binary expression is on the same line as the previous token.

  {
    foo: a
      + b
  }

• The first token of the binary expression is the first token of the statement.

  a
      + b

EDIT: additionally:

• The first token of the binary expression is the first token of an argument of CallExpression/NewExpression.

  foo(
      a
          + b,
      c
          + d
  )

• The first token of the binary expression is the first token of an element of ArrayExpression.

  [
      a
          + b,
      c
          + d
  ]

• The first token of the binary expression is the first token of an expression of SequenceExpression.

  (
      a
          + b,
      c
          + d
  )

[mysticatea]

Mm, I'm considering that the following case (the first token of the binary expression is the first token of a parameter/array element) should have one indent:

foo(
    a +
        b,
    c +
        d
);

[
    a +
        b,
    c +
        d,
];

[mysticatea]

I updated this PR.

[michalsnik]

LGTM 👍