Some functions are not highlighted inside object literal

[kamataryo]

Hello, Thanks for the cool language package! I saw some not-highlighted case.

$ atom -v
Atom    : 1.21.2
Electron: 1.6.15
Chrome  : 56.0.2924.87
Node    : 7.4.0

$ apm list | grep language-babel
├── language-babel@2.77.3

the case is below. It occurs with..

• functions in object literal without curlybraces
• linebreak after =>

const obj = {
  f1: () =>
    outer(inner(aaaAAA, bbbBBB), ccc(), ddd),
}